Biện pháp giúp học sinh yếu toán khối 4
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (191.83 KB, 18 trang )
Bai SKKN Mai Tuyêt Trng
!"#
$%&%%##'(()*+,)*",
-(./"01,(.2340(5264,7"
)*8+9:,7"7;<10=)
*8>*?@
ABCDDEFCDDG ABCDDGFCDHD
HH=IJ KHCJ
*6L"6<M"N#B8"+!"+$
$8$LO4)PN+LQ#6
+M7R3R1S++%%M
R%81&)
P+(828!"86)*6+%%MN%8
O64)T"%8U<M"(V40640W-%40S
&<#340,7"0N6&#U(R40X,)
A7"64,7"YZ[((1\%886(]+#
L7&O$<#\(#^_3)A,%"6@
MSV#(`\<X64,7",
(Vab(@M%#!")
T&8N0=%US%+8V"(V(-M%#
(`@%64(!"`(+B)
1
Bai SKKN Mai Tuyêt Trng
!"#
T&8N0=)
:0W-%c%$(40W- 38)TS d#
&(e01$3)S+R(B *N8"<N
3N40<71"N40<7fO40+N40
<71"fO40+)?40%c%$(%40)
d-U"W8-1O7S,8-%)g"B
S,0=)
$%&$'()*+,
A7"($&8N"63<WN&8$0=3
<h&4(<hH-CC-I)*",-i0j
64S7UO0=V"&67U(64
(`7U&L%j"k<e8%67%\)
l%=\6-6e4Qe$4076
B-V"B-%W\)
T2340(-$W8#S,h4W!"V"7
64,7" 94(`7UL0I "3<#
"3"3\"6(]"3h)
2
-
.)
Bai SKKN Mai Tuyêt Trng
($mK^Eno94%#6#<#K8Z8#RY(h,C= I4
%#6#<#I8ZN87!"#)V",R8V"8
7S,.7)
%M64,7"V"L%c%$,%c%$+8%c%
$4<7
p$=jIC CKno
;$=jqICCK,`40=CCK
=CCK,o94,7"
,$(VM#!",7)
g"6Nrr4!"\(%40!"Z%40%c%$(V%40
38$4((a,)
A`a64R4.3`3(
p$
I = I = s
j K j K HH
+
+ = =
+
94R4<78N<,
p$
I = HE CD IE
j K ID ID ID
+
+ = =
+
T3%408%405."40 9:(3(!"Z,(
8(!"Z)
I = I K HE = j CD
j K j K ID K j ID
+ = = + =
3
Bai SKKN Mai Tut Trng
T+7+R(BL0=46Sm8"<N3N
40<71"O40)*N40<7f1"fO40+)*N
%40O340)t1"+<-"64(`S,o*8N
+<-"4<+R(Bo
p`64,7"#64*dY86(]<
+R(B),7"(N4h80!"18<4e
+SN%$<h$6"
"(B8<+N)
Z5S,6!"$)*7S,7"8W!"437
64R#,7"h%")
P3,7"0c%M!"86`+64f6!"V"7
UO\+V"u)
Để giải quyết vấn đề trên ta phải làm gì?
II / CA /&01)2345$*+, 6
!"#$%&%'()*#+,)-&".),&
/*.0".1#2,)"3
pV&8N0=+f0(340(5340e
%&)0(^_*?@3^_v(54"(5^$4W!"O
%",64h$+340%",<7`-(16L
O\;%V"+B$(N7(-%#1N$W
4
Bai SKKN Mai Tuyêt Trng
&`)A`768-%b(-%SC7a"MN
6,7"#)*8B6(!",,+
1"!"#80%_#64,7"8V")
Pa,(-7%4&3@!"#$(18",<M"R4
6<#U6,0(64,7"64W
10%c%$(#N8S,(N4"3<#
76<e#.)b(6<3%h4W+
BW#<#(18",<+1"!"#1(484
,7")
0($7b(@%4"3<6S%,876<X
`"uY03]X#%W4+4+R
M"V"&)
A7",64%N2,7"(`7UN(S,(
S`7UY+-!"7<68Z7%S,<
648Lw,0x)
p$ yS,<40+<`407"6440+`40
N(S,)b(M%#S(S7UY T;$
(7$U(7$U'
b(.64V";%+B87S40+`40
40+<`40)i+BLao$a64<7
)b(.74W1o
b(+4QZ5S,6,4W@/"@64+$<#
(`40+"4",N5"%k,",40
)
5
Bai SKKN Mai Tuyêt Trng
p$ 401"u40<e1<X"^7",<40
N<40,1<X"uM8@40<e40<e
408L-&#&4z)b(f4QZ58`
7S,8",VS7U)
A8(+4Q<X1Q(`-`4043
,4W@/O4X4"7U){%7+$8"
7S,)
789:;#<=>#)
• &1&?$@*ABC$%D
9S3O( E F7<
• 4 $ 05
E G6$HIJ K:7>
HG== HKCno
b(.
) ;$)
<) *$84%#)
| !"#$%&
F *+HG= HKC
F AkH8BH8BH
F ph,&M"-`40H
' !(#$%&
F IC= HKC
F AkI8BH8BI
F CKI-
&#H2C
F *&UC
94S<W1
F ;$)
F \<_.)
F T\UW84%#
HG==HKC}
DIC=HC
DDD
6
Bai SKKN Mai Tuyêt Trng
b(L9:8-
b(8<)
HG== HKCnHC
• E L6$HIJ K:7;I
MNOP6LNGQR
*7&WW1<
~8S•
6#78-#**9:83
S) T:<I98IK UIV
H W8X7
}TMU
*+E=K C=H
)*+!,*+!$-.&
,/,/01$-.
23!45&$%(
5
)FTMU)
HCIG C=H
5.*+!.*+!$-6&
7/,/01$-6
!4893$%(8&
}40I=
• HG=HKCH(7H
FHCC=8C2C(7C)
FHKKG8K2I(7I
FHHHH8H2D(7D
|9S=IC=IC=HKCC(7
CL&)
FCC==8U=2D(7D)
FCKHCHC8HC2D)
FCHC-HII8I2
D
|94SW1~I4,7"•
E=KG}} C=H
HCIGIj
DI=
• X7"Y
E=KC=HI(7IL&)
}IHIK8I2I(7I)L40)
}I=<XHCH=8HC2C(7CL40
)
}ICK-HsE8s2H
(7H)40HCI)
• 9SG+HCIGC=Hj(7jL
&)
F jHj+G8j2=(7=)
7
Bai SKKN Mai Tuyêt Trng
F j=<XCDCI8CD2I)
F jC<XHD-CHC+HC8
HC2D(7D)
ph,40I=)
;*.,),</=>%' *$&
<8 3?"$>.)8&>8@)8&>83
4"#$-A%B)#$-C.$@)<8D0E#$F@)
,*$@)8 :)>(9&* %
!@%G@-#:C)<),G3
• ZBCm
,%M4z4)AS38%405."40)9:z.3
`3()
I = I = s
j K j K ID
+
+ = =
ph,S,(4<%<14W"`3()
:;<01<
T+4<78N<,)
p$ <
I = HE CD IE
j K ID ID ID
+ = + =
~H•
Nh44
I = I K HE = j CD
j K j K ID K j ID
+ = = + =
:(N8`7M"63%40(,-"M"48N<,\<
8
Bai SKKN Mai Tuyêt Trng
g"Z
I K HE
j K ID
= j CD
K j ID
HE CD IE
ID ID ID
=
=
+ =
~C•
T37!"#!"Z
AN<4328N<,4@@(!"Z(374)
I = I K HE = j CD
j K j K ID K j ID
+ = = + =
~I•
H8%-C <"F(8"#$)8,I.3
6% JJF%*.E#$3K.),L<:8
-'':3;I.#,MNO3P-C.F@E(8%,A4")
<8D0*F.),@'<8,/.,
D0Q/3
p$ dH*8HCs
C I
€
I =
C C = E
I I = HC
I I I G
= = I HC
E G Hs
HC HC HC
+
= =
= =
+ =
~H•
PD0.),.4H)<8*.@*C,*.5&#$N
*.JR*.F% J(8&3STD0*CF*U".)
C*$3T*#+./#8*D0I<8$*(:3
? .*0(4"#$-ASTD0.),=F-V5%I.W
-V#L.)
LHGLM
9
Bai SKKN Mai Tuyêt Trng
)€
I C CH E CG
= s CE CE CE
+ = + =
~C•
*<,(V4"b(.\8N<,6z")
I C
= s
+
I
=
•
C
s
I C CH E CG
= s CE CE
+
+ = =
=(!>(9=(!>(9!>!>&
T+~H•(~C•&8‚8&264@
@L~I•64Sz"(<)
T,642.3" ."3.")
A88`"MS,%M%40b($W&9:-<(L<
h%(8R^",-9:%c%$(V%403"M",z)
• &1&.()$[1&\]*^
*+R(BW`<W73"<!"
`"(B+(V`!"1&!"(%"3+-!"7"3
40R^#,8X,)T+O<+R(B<u`,7"0(V
R(B_\h,<#6O<)9,+f80!"1
`,7"06UW8<(-"8%c%$$%+
N%40<)
*8&8N%=",+V"S+R(B<#%#!"
8NW
):eC,7"08< ~H•%M<7~C•%M"u
:e0!"1`%M_<7(%M<7+h8S&
<#_6%((1#)
th%7S#<
*W1%c%$\8NW7S)
10
Bai SKKN Mai Tuyêt Trng
*QS%40N+8#R@"u<)
0(%,7"+R(B.#+R(B(-M4
W1O<<u4+7)
*_6` t%=>+Ij64(%=d+II6458Z
,)t%=>8ZV"&=dHD,)9ua%8Z<-",<78X
a64V"8Z40,"o
• :?$@$@A>
F9646<$IM)
•d<7No
•duNo
•:0,8ZO%+!"1"7o8)8,881*$M
01BC
at%=>&<-",o4064&<-"o~b=8Y#F7c`
d
•P"0<7a%8Z<-",%#<7No
•yW(4W1O<<740,8ZOa4o~&4&HD
,•
•,SN_6o
F ƒ-"M"4+<
*+)
o,
t%=> rr
t%=d rHD,
o,
11
Bai SKKN Mai Tuyêt Trng
• th%7S#<
•*N404%=>&%=d)
•*N40,8ZOa4-D".)8-#1<8".8-#1()~.
64,7"•
•*N40,8ZO%)
T64,7"S<-"%c%$O<(64,7"#
<3)
b#<\7S
b#
:04%=>&%=d
Ij„IInC~4•
:0,8ZOa4
HD Cnj~,•
t%=>8Z
Ij^jnHsj~,•
t%=d8Z
II^jnHKj~,•
%40 => Hsj,
=d HKj,)
• 94#0&W&bpU646+<S<v6u
.")9:W;"u"4W!"#$Obp)T<Su`N
<7)
p$ 94>u94d
d<7No
duNo
N<S%#+`NoNo
12
Bai SKKN Mai Tuyêt Trng
A`<1%%W18-7S,b(h-R
O1
$ b(7NN"`9:+B+BLU3L$S
o
T+v%#(1((#+R!"7)i+B
(N<7`.\W6-L)i+B(N#
B7%"O\cN8S4Uu\0)*5,\#
(-5N@%…\60&)
*S4WWU@86h%]L64\
<W6"u%5%(064)
p$ *8<40+<`40(-64,7"8#R"
u
F ;/" -#$>8.)X
F P&1/#$ G)*.IX
032&ef*0&)D&g)
AB6CDHD„CDHH64,7"#8‚81
M"BCDHDFCDHH T"0BCDHDFCDHH
s4€CIIJ H4€IIJ
*84064,7"+I64+7<3(<h,7"-364,7"
"0B40YMC„I„=\_8v8vS40s
!D?"E!E$%* 9E!$-FB!#GH
G$*I?J-@G$-&K!L
13
Bai SKKN Mai Tuyêt Trng
AD??"H$E!*M9H$
?""0D<A$N0OP&
h i
tb(S,"6M%#&N"6 i8-%
S,%##0%U%((S7U
&8NY(5e7UO%7%\)
T@/8N<,O64W1%c%$#(N,,7"0
c%M!"86)964"(#<NO%#
<78N<,,]%+%%M64$k[$
8(1NO64)
*87b(MSV"1\63]W-
2<+B†)964+U@6h%(6(&)
b(BR4Q1QZ5S,6768W!"4
3@%644"7U)
14
j5$k
Bai SKKN Mai Tuyêt Trng
*$ff1NO(7"S,b(<u!"7
<.$,#`"uz94
,7"@%64W+U@6h%+#<e<u!"-)
b@%9:%au7U,7"9:(V",<X%
S8<")
l m7F7i !"#6
g"(1-U"Vwd1%%@%64,7"0=x)dX`
<1%%8-h,1"!"#)*8R-U",+
V"V"h$@+‡+(&8N"6+S
(<#(+(1Rb(-)
jn " _ Hoh7
dX`<1%%8-8B6CDHDFCDHH%=>4064,7"
#(CB7%^@&8N0=<#8@8340
1#S,8++18v64,7"`
1,_85Z1%8(Z1%0
)
*j> pqr#Y
G9 `!)
Fb(6u8Z7U8N3",- *R
^",-WRB%\/76u1."%",
,0ZR%",7O<#)
Fg"V"&(64,7" *N"#N$64
f6e%R@%…\+\6V"&%N8S
u7U)
15
Bai SKKN Mai Tuyêt Trng
Fd#(-%#8‚NN%8‚04,7",7"ao
L$s#=!t
F*8<"6%",-L+(82O0M%#88N
WUO7S,e@%…(-8(18v64
,7")*R^",-#7S,\",-V8v64,7")
u*9HIJ
Fi`82L83%S(8R(",-V64
,7"$aB3M)
F*SV"1b(8v64,7"8<" *R%26Z5S,
6)
F *B-Z5S,687)
B?A/$-I9$-?A/9!L?
"Q0"00+$*?0E/I!
(&
*"!;?!H?0,$-*R*G0
I!#+!(@&STQ0#<
IB$-I%&
AR(7
P*",7*8
16
Bai SKKN Mai Tuyêt Trng
PˆTtˆT
'''''''''''''')'''))8H
r€d0#''''''''''''''''''''8H
rr€t$6V''''''''''''''''))8H
rrr€?S(-U"'''''''''''''''8H
?9‰AAŠry‹Ab'''''''''''''))8C
r€*W8S(V)'''''''''''''''''8C
rr€T<1%%#!",7(V)''''''''''')8I
17
Bai SKKN Mai Tuyêt Trng
rrr€91"!"#O(1-U")'''''''''''')8G
?9‰AiŒ*t‹•A'''''''''''''8HD
r)d61''''''''''''8HD
rr)Ž[-U")'''''''''')))'8HD
rrr)i#BU8)'''''''8HD
rp)i7eV^")'''''''''''))8HD
18
