>> Truy c h Sinh Anh tt nht! 1
:
(1).
(C)
M(C(C)M
d: x + 3y +1 = 0.
. .
(1u
a) . b)
(0,5 .
(0,5X
1,2,3,4,5,6X
OxyzA(-1;4;6)B(-2;3;6).
(S)OxAB(S)
Oz.
S.ABCABCaSAB
SS.ABC
SBAC.
Oxy chABCDF(
ADEK EAB
KDCKD = 3KCCABCD
.
10
a,b,c
>> Truy c h Sinh Anh tt nht! 2
Ni dung
m
32
1
3
y x x
Kh bi v th
1.Tnh : D = .
2.S bi :
2
'2y x x
;
0
'0
2
x
y
x
3
11
lim lim [x ( - )] = +
3
xx
y
x
3
11
lim lim [x ( - )] = -
3
xx
y
x
Bng bi
0 2
0 0
0
4
3
ng bing
nghch bin .
i ti
0x
y
= y(0)=0.
0,25
THI
:
>> Truy c h Sinh Anh tt nht! 3
c tiu ti
2x
y
CT
= y(2)=
4
3
th
Giao Ox: (0;0), (3;0)
Giao Oy: (0;0)
' 0 1yx
th nhn I
2
(1; )
3
m ui xng
f(x)=(1/3)x^3- x^2
-8 -6 -4 -2 2 4 6 8
-5
5
x
y
>> Truy c h Sinh Anh tt nht! 4
s
1
3
k
.
Gi
0
x
m M
Ycbt
0
1
'( ).( ) 1
3
yx
0
'( ) 3yx
2
00
2 3 0xx
0
0
1
3
x
x
4
( 1; )
3
(3;0)
M
M
1
[ ;2]
2
+)
2
2
2
'( )
( 1)
xx
fx
x
;
+)
1
0 [ ;2]
2
'( ) 0
1
2 [ ;2]
2
x
fx
x
+)
17
()
26
f
;
7
(2)
3
f
+)
1
[ ;2]
2
7
min ( )
6
x
fx
;
1
[ ;2]
2
7
max ( )
3
x
fx
a)
1
3
3
x
Vu ki
22
(3 1) [2(3-x)]
log log
x
3 1 2(3 )xx
>> Truy c h Sinh Anh tt nht! 5
1x
KL: Kt hu kim
1x
Pt
2cos ( 3sinx-cos 1) 0xx
cos 0
1
cos( )
32
x
x
2
2 ( )
2
2
3
xk
x k k
xk
Z
22
00
1 1 1
()
( 1)( 2) 1 2
I dx dx
x x x x
22
ln 1 ln 2
00
xx
3
ln
2
+) S cng
abc
+)
3
6
()n S A
c ch s b
( ) 12nB
12
( ) 0,1
120
PB
+) I(a;0;0) thuc trt cu
22
IA IB IA IB
2 (2;0;0)aI
2
61R
t cu:
2 2 2
( 2) 61x y z
>> Truy c h Sinh Anh tt nht! 6
+) T m ca (S)
2 2 2
( 2) 61
0
x y z
xy
57z
(0;0; 57)
(0;0; 57)
M
M
+) GT
()
2
SH ABC
a
SH
+)
2
3
4
ABC
a
S
3
.
3
24
S ABC
a
V
( , ) ( ;( , )) 2 ( ;( ; ))d AC SB d A SB d d H SB d
+)
( ;( , ))d H SB d HK
2 2 2 2
1 1 1 28 3
3
27
a
HK
HK HJ SH a
3
( , ) 2
7
d AC SB HK a
>> Truy c h Sinh Anh tt nht! 7
+) gt
Cng 5
52
EF
2
+) T m:
22
11 25
( ) ( 3)
22
19 8 18 0
xy
xy
2
58
17
x
x
5
(2; )
2
E
m I c
EF
AC:
7 29 0xy
10
7 29 0
3
:
19 8 18 0 17
3
x
xy
P AC EK
y
y
10 17
( ; )
33
P
9
(3;8)
5
IC IP C
:
2 5 3 0xy x
+) T pt (1)
22
x y x y
VT x y x y VP
0xy
c :
2 2 2
6 2 5 3 (2 5 3) 0x x x x x x
(loi
)
(loi
)
>> Truy c h Sinh Anh tt nht! 8
2
2
3
1
2 5 3
1
2
2
1
2 5 3
3
x
x x x
x
x x x
33xy
H t nghim (3 ;3).
10
2
22
,
22
x y x y
xy
22
1 1 4 2 2
( , 0)xy
x y x y
xy
Dy ra
xy
+)
2 2 2 5
P
a b b c c a
ab bc ca
Gi s
abc
:
10 10 20 2
2 (1 )(1 3 )
P
ac
ab ac bc b b
14
(1 )(1 3 ) (3 3 )(1 3 ) 10 6
33
b b b b P
Min P
1
2
26
10 6
6
26
6
b
a
c
c