Tài liệu BAÌ GIẢI CHI TIẾT MỘT SỐ CÂU ÐỀ THI TUYỂN SINH ĐẠI HỌC KHỐI A, A1 NĂM 2013 Môn thi : VẬT LÝ potx

 !"#
$%&"#'())(*)+,)
BAÌ GIẢI CHI TIẾT MỘT SỐ CÂU ÐỀ THI TUYỂN SINH ĐẠI HỌC KHỐI A, A1 NĂM
2013
Môn thi : VẬT LÝ – Mã đề : 426
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6,7
89&:;&<=>?15325'
65(
9&:""
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)
9@C@DE15'
+

I. PHẦN CHUNG CHO TẤT CẢ THÍ SINH (40 câu, từ câu 1 đến câu 40)
Câu 1: F&<"#
'
 G  = ω
HIJH;
'
G
K
ω
AB&LJK&M&NN!:
>ABM%.#;O&<P&<H>&L&DQJR1
'

SDE
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5

ϕ
H
5
'
+
π
< ϕ <
JK&<"#<O&M:>
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'
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+ 5
+
π
ϕ = −ϕ
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gần giá trị nào nhất&>Y
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$%
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5
+

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U
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+
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5
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+
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
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J
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+
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

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,
5C
Z
J
+
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+
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+
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+
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+
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+
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Z
U

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L
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+
Y
5
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Z
Z
C
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HbJ
ϕ
5
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R
ZZ
CL 5
−
9ϕ
5
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R
ZZ
CL +
−
1
R
Z
Z
C
L
,

5
−
+ 5
+
π
ϕ ϕ
= −
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5
aϕ
+
1
+
π
66666]ϕ
5
ϕ
+
165HSϕ
5
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R
ZZ
CL 5
−
R
Z
Z
C
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−
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JH_

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,
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Z
J16`
+
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`
+
a_

+
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
,
5C
Z
a
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+
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+
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ZZ
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Z
a
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6
2
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L
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5
,
+
Y
5
−
Z
Z
C

1G
5
+
Do đó U
0
= U
+

= 2U
d1

= 90V.
Câu 2:@:=<d6e""3-D;P""&UK2''3
A%"fAg#K5R%"hF#ijA&.K"
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Z53+ [534 '3( \'3,
5
 !"#
$%&"#'())(*)+,)
\k
D
i
a
λ
=
153+5'
−
,
153+
Câu 3:@=<d6e""3.>""&UK-/
""&UKKKf>?"&eA<A"S@?K"
ZA%AB>&L [A%0?
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λ
K
]λ

⇒
K
]


Câu 4:mP&<hPM5'nop@>e@AB;-D;PK
Z2' [2 ,' \,
c
f
λ
=
1,'
Câu 5:F&<"#1
5+' +  + qπ
HIJHq>&L&DQJK&M&NN.#
!:%MP&:r%3&<@s`KO&<P&<O3;`
+
c+Rq1q
5
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+
1
5
q +
S&<"#<Of
&M&<@s&Nr&NRq1q
,
S&<"#<Of&M:%&Nr&N
G
l
$"@WXG
l
gần giá trị nào nhất&>Y
Z5*,I [4*I 574I \)4I
$%"#O

5
G
G
+
+

+
'
+
nZt
=








+








ω
ω

>
5
+
+
+
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+
=+
L
C
L
f
f
U
U
I;q
,
q
5
1q
+
+

?q
,
1+q
5
>q

1+q


h&P=&AG
l
15,)I
Câu 6 :n:uv&:&eTC@Owl;-?&:43AS+NE&k
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Z
l 4H  J
+
π
= π −
HJ [
l 4H+  J
+
π
= π −
HJ

l 4H+  J
+
π
= π +
HJ \
l 4H  J
+
π
= π +
HJ
Câu 7:xrX:">#"&<l>e:#K&M&NNZ3[
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Ω
3:%MP&:r%KO&<P&<5*23)
yµ

[v&<@sMX":>X">#"[.@B">#"PF#rR@B
>&e;&:
5
 5,4'=
T#zF
+
 5)''=
T#zSB{?OX&N
NZ[KD:r%P"@Wgần giá trị nào nhất&>Y
Z'3)o ['3*o '32o \'3+o
$%
=→
−+
=
−+
→= L
C
LR
C
LR
ZZ
+
+
+
+
+

+
+
5
5
+
+
5
+
+
+
+
+
5
5
+
J

5
HJ
5
H
ω
ω
ω
ω
ω
ωξ
ξ
Câu 8 :n:uv&:&eT:|&NiK5+\&:K>P-?
&:K

Z, [+7 2 \5+
$%
A=12/2=6cm
Câu 9:n:NPADQ}
'
>.DU&3ADQ&:HADQDU
&=JXNK>A>k&:;&:'32HK&:""@ABJK
Z53+4
'
 ['3,2
'
53*4
'
\'3+4
'
Giải
+
 !"#
$%&"#'())(*)+,)
' '
'
+ + +
53+4
5  5 '32
m m
m m
v c
= = =
− −
Câu 10:n:Tl!uvPADQ5''KTlP&:j7'x&DQ&F

@?F#iAB"Iuv&/>?sW@=-/3N1'3"Or
y1+x?uvHS~J&:&eT&.E&k

,
π
=
Sh"
Ory\&:&eTXAABTry"OP"@W-?&:gần
giá trị nào nhất &>Y
Z( [55 4 \*
Giải:
az&Mu&sI[SPy"OSu>I[~;Kw•"I[€K
m
K
F
'43'=
= 5cm mà lúc đó v = 0 nên A= OO’ = 5cm. Chu kỳ dao động T =
s5'
π
+ Sau khi vật đi được
5+7
,
5'
,
,
TT
T
T
++==
π

vật có toạ độ x =
,43+
+
,
=
A
cm và v = v
max
/2
+ thôi tác dụng lực F thì VTCB lại ở O vì vậy nên toạ độ so với gốc O là x =
A
A
+
+
,
biên độ mới là A’:
A’ =
=++
+
+
l
+
J+H
J+,HH
ω
v
AA
9.659cm
Câu 11:F&<"#
++' + 5''u t

π
=
HIJK&M&NN.#!&<@s
5''R
= Ω
3O&<P
7
5'
+
C
π
−
=
yK:%MP
5
L
π
=
o[kjDE&:T&<
@&NNK
Z
+3+ +  5''
7
i t
π
π
 
= +
 ÷
 

HZJ [
+3+ 5''
7
i t
π
π
 
= −
 ÷
 
HZJ

+3+ 5''
7
i t
π
π
 
= +
 ÷
 
HZJ \
+3+ +  5''
7
i t
π
π
 
= −
 ÷

 
HZJ
Câu 12:$%•:<‚@@>eB&&j>?;F&{s:&:
l"&W@F#it=N@"{9&DEi<;@"{&A
&:'@"{D:%M3-"A=K2,*'A3ADQK25'
+7
AKAS>
@OXPK+7E9/{#ƒ$1232*5'
655
x
+
A
+
mPrHq],'nopJ
#"h<@>ei&."&k/@?t=N@"{@A%A&:K
?D;&>Y
ZhA&:*(
'
+'•&.A&:*(
'
+'• [hA&:),
'
+'•&.A&:),
'
+'•
hA&:)4
'
+'•&.A&:)4
'
+'• D. Từ kinh độ 81

0
20’T đến kinh độ 81
0
20’Đ.
$%
&:<-/|&NH&DE&JASHKE&5
T1+7J
1+πH`aJ
,
w w•
,43+
 !"#
$%&"#'())(*)+,)
hd ht
F F=
⇒
+ +
+ +
 7 H J
H J H J
GM m mv m R h
R h R h T
π
+
= =
+ +
⇒H`aJ1
+
,
+


7
GM T
π
17+55+)*5
⇒1,4*7+)*5
IS<#"Pr?P@>ei&.F&{KSvM;N-s
vnx@?S~
$CIKW@=<kn3xKA&:P&-/"@WPα
 '545+
OM R
OV R h
α
= = =
+
⇒α1)53,
'
1)5
'
+'„

Câu 13:n:!#"P&:&eTN@P@T&!w@>e@?FD;
;-D;Pλo&knKx:FD;3/@?#DU@>ePK"#M
•D;&&:[.wn1)λ3wx15+λKwnBP;wx@?&Nnx3
&kK#M•D;&:DQ#;&:X!wK
Z4 [7 2 \*
$%
f&kDQ#;w"w:&N1HAa'34Jλ;wn1)λ≤≤wx15+λ⇒P7
&k=Q#UA1…)3(35'355†
Câu 14:$Cn3x3^K"&k@?:Tlg3&DQ@i&js&kw&WRT

lPeKr?Swn1nx1x^15'$uvK&MD;^XTlKA=
=&ku&:&eT#DUi&j@"@S&:3}&:;r
A‡;{K&:;rA‡v{"O?w-/,9Tl&e9A%";
{f&knKxK5+{>π
+
15'Iu&:;MK
Z+3(op [,34op 53*op \+34op
$%
anx
l
15+?eK;{XTlK

l
1,21
'
aZa
cmlAl 2
''
=∆+→∆
H5J
a-Ky
l
1,y

?VKP
Al +
'
=∆
H+J
h53+VK=&rq1+34op

Câu 15:oNP&:OAK;SP
Z0DQ?A.Kv [0DQ?A.K;
0DQ?A.@?K; \0DQ?A.@?Kv
Câu 16:RPe#BB3#"-kKD;&>&zY
Zx0DQX#BBK;A-D;P""j;#BB&PK;
[BBPk!N@@N"&j>?
I;ˆ""&UPMql"&W3"#BB&e0DQD
\x0DQX#BB""=vU0DQX#BB""&v
Câu 17:@?:Q>&K!K53&M&W3&PPh;4zPHAk%
&M>J[D;PXP@>e@?&>K
Z5 [534 '34 \+
$%
4zP⇒A143λ1+lA1+571'34
R
R h+
O
M
V
α
N
7
 !"#
$%&"#'())(*)+,)
Câu 18:F&<"#1
++' + 5'' t
π
HIJK&M&NN.#!&<@s
+'Ω3:%MP&:r%
'3)
π

oKO&<P&<
,
5'
2
π
−
yR&<"#jEf
&M&<@s-/
55' ,
IS&<"#jEf&M:%P&:;K
Z,,'I [77'I 
77' ,
I \
,,' ,
I
Câu 19:oN&:&<h=Ds&P&:&<hr<=XO&<
@N&:j{KjMDQK
5
K
+
;
+ + 5*
5 +
7 53,5'q q
−
+ =
3=-/
‰E&k3&<=XO&<KDE&:T&<@N&:j{MDQ
K5'
6(

K2Z3DE&:T&<@N&:jP&:;-/
Z7Z [5'Z )Z \2Z
$%

5
15'
6(
K
5
12ZK
+ + 5*
5 +
7 53,5'q q
−
+ =
H5J
.
5
15'
6(
KH5J
+ + 5*
5 +
7 53,5'q q
−
+ =
H5J⇒
+
1,5'
6(


+ + 5*
5 +
7 53,5'q q
−
+ =
{>&NK+.E⇒
5 5 + +
) + 'q i q i+ =
H+J

5
15'
6(
K
5
12ZK
+
1,5'
6(
KH+J
5 5 + +
) + 'q i q i+ =
⇒
+
1)Z
Câu 20:n:T#%j#NPB{+''n@/K-:0DQKT
#%jK>@&er#NX
+,4
GK&!WK>}-W?-s"@S#

Nˆ0P,24K>9ˆ#N@+''nI9Z6B66&@Bx
Z
123'+5'
+,

65
RDQ
+,4
GKT#%j?O@,0K
Z72532A [72532 +,'3)A \+,'3)
$%
11x
5
;
5
1+''nI1+''5325'−
5,
891,,24+7,2''HJ
⇒x1H
5
J⇒1n1xnx
Z
1nH
5
x
Z
J1+,')+,1+,'3)+,A
Câu 21:@:=<ePD;3!PA.Q#w
5
Kw

+
&:
‚#3‚-?&:C<C&:BPwl>H:FD;J;C&:KW@=&F
!w
5
T!w
+
/@?@Ow>o&kK/@?wlPw1734Kw1
)\W>k!w
+
@?@Ow>&.W@=P
·
+
PO Q
P"@W;{S#M
•D;NAB&:T#M•D;N&:;-?&:r&N[.fK
ABTr&NKA"@?&Nw3&kM{K"#M•D;&:;
-?&:r&N":&NK
Z535 [,37 +34 \+3'
Câu 22:\‚:NαP&:0*3*nI-KN 
57
*
N
&&j>?>@
#%j
57 5 5*
* 5 )
N p O
α
+ → +

oN#@BB->@#DUBP;#DU->;X
NαADQ"N
α
173''549

153''*,9
x57
15,3(((+9
w5*
1523((7*
[.51(,534nI
+
:0XN
5*
)
O
K
Z+3'*4nI [+3+57nI 23574nI \53,74nI
$%
Wu-%K&:DQ
p O
p p p
α
= +
r r r
S
p
p p
α
⊥

r r
?
+ + +
O p
p p p
α
= +
⇒+
w
R
w
1+
α
R
α
a+
#
R
#
H5J
Wu-%K0DQ
H J(,534
N p O p O
K m m m m K K
α α
+ + − − = +
H+J
PR
α
1*3*nI3%<H5JKH+JS&DQR

#
17375*nIKR
w
1+3'*4nI
4
 !"#
$%&"#'())(*)+,)
Câu 23:$;N&<X:ANK'3*4µB"?@@AvANK>
-/
Z+3245'
65(
8 [+2345'
65(
8 +3245'
6,+
8 \+2345'
6,+
8
$%
hc
A
λ
=
1+3245'
65(
8
Câu 24:F&<"#1G
'
ωHG
'

KωAB&LJK&M&NN.#!
&<@s`3O&<P&<3:%MP&:r%>&L&DQR1
5
K
1
+
9&<"#<Os&M:%P‚"@W9&:<#X&<"#s&M&N
N;DE&:T&<MDQK'34+@K53'4@R1
'
9&<"#<O
f&M:%&Nr&N9&:<#X&<"#s&M&NN;DE&:
T&<Kϕ$"@WXϕgần giá trị nào nhất &>Y
Z534*@ ['3),@ '3+2@ \'375@
Câu 25:K&>không#%K#PlNY
Zγ [β
a
 α \t
Câu 26:"j0DQX"@N"hX>?•&@B&DQl"&W-/-k
j
+
5,32
n
E
n
= −
HIJH153+3,3ŠJx.>?•&@B{#O:#BBP0DQ+344
IS-D;Pv{X-jlNK>?•&@B&PPk#"@K
Z53725'
6)
 [53++5'

6)
 73)*5'
6)
 \(3*75'
6)

Câu 27:n:PS&@>e@?:Q>e
DUX@OwloS~B%SNXQ>NE&k

5
H&DE‡&jJK
+
1
5
a'3,HJH&DEe‡J
NE&k
+
3uX&kx@?&>K
Z2437 [62437 6,(3, \,(3,
Giải:
+ Từ hình vẽ dễ dàng thấy:
cm7'=
λ
Tốc độ truyền sóng: v= 15/0,3 = 50cm/s
Chu kỳ sóng: T= 40/50 = 0,8s
+ N đang ở VTCB và dao động đi lên vì vậy:
V
N
= v
max

=
A
ω
= 39,26cm/s
Câu 28:FK&M:U{#X">-."#n
5
:&<"#l>eP"@W<
O+''IR&M:U{#X">-."#n
+
K&M:j{#Xn
5
S
&<"#<Os&M:j{#Xn
+
&ks-/5+34IR&M:j{#
Xn
+
;&M:j{#Xn
5
S&<"#<Os&M:U{#Xn
+
&ks
-/4'I[vC#=n
5
P}fT>:U{#KT>:j
{#-/
Z2 [54 ) \7
Câu 29:n:A>ƒ#i3g3SfuP<=2'
+
3>&e:

@O&ljH:F#iXAJ@h@DE&ePU%jhBP;
@O>KP&:;'37hBr&NA>K
Z+375'
6,
- [53+5'
6,
- 73)5'
6,
- \'325'
6,
-
$%
BSΦ =
1'372'5'
−
7
1+375'
6,
-
Câu 30:<0&DQ@>ehU#"&.:AD-/&DE>:#;<
{@>e%K('‹#=&<0}v<@?&DE>KABDQ"
+'‹x.B{•O&<XADK>0+'‹Kf>?&<"#sU#"
S<{@>e%&<0@?=&DE>&PK
Z)43)‹ [)*3*‹ )(3+‹ \(+3)‹
2
 !"#
$%&"#'())(*)+,)
Câu 31:[.-"A=[K@
'
143,5'

655
["A=|&Nhn@>?•&@B-/
Z)73)5'
655
 [+53+5'
655
 5,+345'
655
 \7*3*5'
655

$%
nP1,3@1,
+
@
'
1(43,5'
655
17*3*5'
655

Câu 32:o&UPeKMDQK)5K27&DQ@s@M:0#T
R"uvX&sW@=-/3&!E@>ez"u‚
D;&:&eT;‚-?&:P3@F#i
;$C∆KA%E{Akhz@>eu&.z>@
$"@W∆gần giá trị nào nhất &>Y
Z)35+ [+3,2 *3+' \'374
$%
a\NK>{KI&:l
5

3l
+

t
5
1ZH
J
+(3'
ππ
+t
9t
+
1ZH
J
+)3'
ππ
+t
ao>Al
5
1l
+
%SP

1'37+,
Câu 33:n:uv&:&eT#DU@Sl1Z7πH=-/J=h1'3
A%E{&kXuP&:;-/:•&:;r&NK
Z'3'), ['35+4 '35'7 \'352*
$%
121'342155+1'3'),,,,
Câu 34:o&:&eT‚#DU3‚MP-?&:MDQKZ

5
1)3Z
+
154
K<#
+
π
\&:LQ#X&:K>P-?&:-/
Z* [55 5* \+,
$%
+ +
5 +
A A A= +
15*
Câu 35: $C
ε

K0DQX#BB""&v9

ε
K0DQX#BB""O9
I
ε
K0DQX#BB""Km#l.#K&>&zY
Z
ε

]
I
ε

]

ε
[

ε
]
ε
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]
I
ε
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I
ε
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
ε
]
ε

\
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ε
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I
ε
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ε


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Câu 36: o<>@r?j&!W#PlN
+,4
G
K
+,)
G
3;Œ<N
+,4
G
K
N
+,)
G
K
*
5'''
[.AS-"@X
+,4
G
K
+,)
G
MDQK*3''5'
)
0K734'5'
(
0
"&>-?03@r?PŒ<N
+,4

G
KN
+,)
G
K
,
5''
Y
Z+3*7}0 [+3++}0 53*7}0 \,354}0
Câu 37: @?:&DEi&W@B@DE&iD;3AB{#OK#%lN
3:">s"!:A%&DQPjDE&:K9AW
>k">@l!?(SjDE&:&DQK +'H[JR%
"K
Z) [5 ( \5'
Câu 38: @AB3""P-D;P;{@"""&U&v3
K33=K
Z""= [""&v ""K \""
Câu 39: NN.#!
:%M3&NNtKO&<HS~J
*
 !"#
$%&"#'())(*)+,)
R&FK&MZ3[&<"#
Z[ '
 G H  J= ω + ϕ
HIJHG
'
3
ω
K

ϕ
AB&LJS
+
 5ω =
3
Zx
G +4 +I=
K
n[
G 4' +I=
3&!E
Zx

;#
,
π
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n[

$"@WXG
'
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Z
+4 57I
[
+4 *I

5+34 57I
\
5+34 *I

$%
aS
+
 5ω =
?G

1G

u>
Z[
1
t
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t
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1+
t
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Z[
ABMBAN
UUU +=+→


h%&!VKS&DQG
'Z[
1
+4 57I
Câu 40: n:uvADQ5''&:&eT;AS'3+KU0K'35)8
H.0NW@=-/J9{>
+
5'π =
N&:
, +
3}&:0K.0K
Z, [7 + \5
+
5'
T
π
ω π
= =
3
+ +
'3'2 2
+
m A
W A m cm
ω
= ⇒ = =
9
+ +
+

d t
t t
W W W
A x
W W x
−
−
= =
15
Câu 41 : RPe#LN#"lN3#"-kK&>K saiY
Z#LN#"lNX:>?K:<fN"@?•30
"-sfA%
[#LN#"lN{@F{v#"@A-WP
@#LN#"lNX>?•&@B3s‚""S{>P-N
&F@DKN&v3N3NKKN=
\#LN#"lNX">?"CA"SA"
\k
Câu 42: n:N=Ds&r<&:&<hr[.&<=r&NXO
&<K
'
KDE&:T&<r&N@NK^
'
NE&kDE&:T&<@
N-/'4^
'
S&<=XO&<P&:;K
Z
'
 +
+

[
'
 4
+

'

+
\
'
 ,
+
Câu 43:ADQXN#@BB3U@BKN&U@
+
5
\
MDQK53''*,953'')*
K+3'5,2[.51
+
(,534nI 
x0DQ?A.XN
+
5
\
K
Z+3+7
nI
[737)nI 535+nI \,3'2nI
Câu 44: n:uv&:&eT;-?&:7KAS+&DEu&&DQ
@7K

Z) [52 27 \,+
$%
171+⇒m1+7Z1+771,+
Câu 45: n:&UPeK5+53&:&eTNUP@C@DE
{>
+
5'π =
AS&:XK
Z5 ['34 +3+ \+
+
l
T
g
π
=
1+3+
Câu 46: $%•:!"}#"@""&UPM*45'
57
opB{#"
lNX!K5'm#BBK!"#"@@:>l{#l}-/
Z'3,,5'
+'
[+3'55'
5(
'3,,5'
5(
\+3'55'
+'
W N Nhf
P

t t t
ε
= = =
⇒
Pt
N
hf
=
)
 !"#
$%&"#'())(*)+,)
Câu 47:F&<"#1G
'

5'' 
5+
π
 
π −
 ÷
 

HIJK&M&NN.#!&<@s3
:%KO&<PDE&:T&<NK1^
'

5'' 
5+
π
 

π +
 ÷
 
HZJo<B{
X&NN-/
Z53'' ['3)* '3*5 \'34'
ϕ1ϕ

−ϕ

1−π2ϕ1'3)22
Câu 48: r<=<d6e;""&UP-D;P
λ
R%
"fAg#K5@?K"3N&kn"@73+P
"-u4$f&W"&eA<A"3>kMK"C&DEi
BP;F#ijA@l&.ANn>kK
MjSA%WKK'32[D;P
λ
-/
Z'32
µ
['34
µ
'37
µ
\'3*
µ
$%
153l173+

z&M"A14
k D
x
a
λ
=
H5J
RK@lMS\KA‡0M3znKMj+SPKj7
A•1,K\•1\a'32⇒
H Ž '34J H '32Jk D
x
a
λ
+ +
=
H+J
hH5JKH+J>@4\1,34H\a'32J⇒\1537
hH5J⇒
ax
kD
λ
=
1'325'
−
2
1'32
µ
Câu 49: @:=<ePD;3!PA.Q#&:‚#
N&kZK["52mP@>e@?FD;;-D;P,@?&N
Z[3&kKN&P#M•D;&:;-?&:r&NK

Z5' [55 5+ \(
l l
k
λ λ
−
< <
Câu 50: F&<"#l>e1G
+

ω
HIJK&M:&<@sM`155'
Ω
S
DE&:T&<&<@sP"@W<O-/+Z$"@WXG-/
Z++'I [++'
+
I 55'I \55'
+
I
$%
G1^`1++'
(
 !"#
$%&"#'())(*)+,)
B. Theo chương trình Nâng cao (10 câu, từ câu 51 đến câu 60)
Câu 51: n:u@>:@O
∆
&W;&:P,'@n"=X
u@&;@O
∆

K2A
+
n&:DQXu@&;@O
∆
K
Z+'A
+
 [5)'A
+
 4''A
+
 \+*'''A
+

Câu 52:•@KNU{#:N
Z?pB [#B B \#?@
Câu 53: @?:&DE@>iP:!m&j>?#"@;MqK:
">n>k&:@lm;&:[.&:@>eKH]JMXK
">u&DQK
Z
q
 +
[
q H J

+

q
 −
\

q H J

−
Câu 54: n:TlPADQuvK
5
 ,''=
&:&eT;AS5
x.>uvPADQ
5
-/uvPADQ
+
S&:;AS
'34$"@W
+
-/
Z5'' [54' +4 \*4
Câu 55: F:&<"#l>eP"@W<OAB&LKMq>&L&DQK
&M::%MRq14'opSDE&:T&<:%P"@W<
O-/,ZRq12'opSDE&:T&<:%P"@W<O-/
Z,32Z [+34Z 734Z \+3'Z
Câu 56: nN&:=Ds&N&:3&<=r&NXO&<K
2
'
 5' 
−
=
K
DE&:T&<r&N@NK
'
^ , Z= π

=hE&k&<=@?OK
'
3
A%E{&kDE&:T&<@NP&:;-/^
'
K
Z
5'

,
[
5

2
µ

5

+
\
5

2
Câu 57 :[&M:ƒ{#PlN>?{Px
'
N[.AS-"@X{
#PlNK>KmE73AkhE&k-&M3ND#@Xƒ
{#PlNK>K
Z
'

54
x
52
[
'
5
x
52

'
5
x
7
\
'
5
x
)
Câu 58: o%MvPADQMDQK+37AK'32As&M:j
Kgn"=X<&;@O>&@&kXKBP;
K'35+A
+
eKXK
Z'37 ['32 '3) \'3,
Câu 59: n:-"l&>&e@O
∆
&W;&:0K++48[.
"=X-"l&;@O
∆
K+A

+
&:PX-"lK
Z4234@ [,'@ 54@ \55+34@
Câu 60: n:&•@T3#i3&!{P"=)A
+
&;@O
∆
&W&
&•KBP;-eF&••>
∆
;P-/,@nr
"O?&•&;@O
∆
P&:;K
Z+7x [
)
,
x 5+x \
,
)
x
5'