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TR働畛NG THPT TRI畛U SN 3
畛 CHNH TH畛C
畛 KI畛M TRA KI畉N TH畛C THI THPT QU畛C GIA
NM H畛C 2014-2015 (L畉n 3)
MN TON
Th畛i gian lm bi 180 ph炭t
C但u 1 (2,0 i畛m) Cho hm s畛 c坦 畛
th畛 l
a. Kh畉o s叩t s畛 bi畉n thi棚n c畛a hm s畛 v v畉 畛 th畛
b. Vi畉t ph動董ng tr狸nh ti畉p tuy畉n c畛a 畛 th畛 t畉i i畛m c坦 honh 畛 b畉ng -2.
C但u 2 (1,0 i畛m) Cho ph動董ng
tr狸nh:
a. Gi畉i ph動董ng tr狸nh khi
b. T狸m 畛 ph動董ng tr狸nh 達 cho c坦 nghi畛m.
C但u 3 (1,0 i畛m)
a. T狸m ph畉n th畛c v ph畉n 畉o
c畛a s畛 ph畛c
b. Gi畉i ph動董ng tr狸nh
C但u 4 (1,0 i畛m)
a. T鱈nh t鱈ch ph但n:
b. Cho t畉p h畛p A c坦 50 ph畉n t畛.
H畛i t畉p A c坦 t畛i a bao nhi棚u t畉p
h畛p con c坦 s畛 ph畉n t畛 b畉ng nhau?
C但u 5 (1,0 i畛m) Cho h狸nh ch坦p S.ABCD c坦 ABCD l h狸nh thang vu担ng t畉i A v B,
c畉nh BC l 叩y nh畛. G畛i H l trung i畛m c畉nh AB, tam gi叩c SAB l tam gi叩c 畛u
c畉nh , m畉t ph畉ng (SAB) vu担ng g坦c v畛i (ABCD). Cho SC v kho畉ng c叩ch t畛 D 畉n m畉t
ph畉ng (SHC) l .
a. Ch畛ng minh r畉ng SH vu担ng g坦c v畛i CD
b. T鱈nh th畛 t鱈ch c畛a kh畛i ch坦p S.ABCD
C但u 6 (1,0 i畛m) Trong kh担ng gian
v畛i h畛 tr畛c t畛a 畛 Oxyz, cho m畉t ph畉ng (P): v c叩c i畛m A(2; 3;- 4),
B(5; 3;- 1)
a. Vi畉t ph動董ng tr狸nh m畉t ph畉ng trung tr畛c c畛a o畉n AB
b. T狸m t畛a 畛 i畛m M thu畛c (P) sao cho tam gi叩c AMB vu担ng c但n t畉i M.
C但u 7 (1,0 i畛m) Trong m畉t ph畉ng t畛a 畛 Oxy, cho tam gi叩c ABC c坦 A(1; 1), g坦c
BAC b畉ng 600
v n畛i ti畉p trong 動畛ng tr嘆n c坦 b叩n k鱈nh . Vi畉t ph動董ng tr狸nh
動畛ng th畉ng BC, bi畉t 動畛ng th畉ng BC i qua M(-1; 2) v tr畛c t但m H c畛a tam gi叩c ABC
n畉m tr棚n 動畛ng th畉ng (d): x-y-1=0.
C但u 8 (1,0 i畛m) Gi畉i h畛
ph動董ng tr狸nh
C但u 9 (1,0 i畛m) Cho la
cac s担 th動味c thoa man
va Tim gia tr畛 nho
nh但t cua bi棚u th動c: .
..................H畉t.................
Ch炭 箪: Th鱈 sinh kh担ng 動畛c s畛 d畛ng ti li畛u, kh担ng 動畛c trao 畛i bi. Gi叩m th畛 kh担ng gi畉i
th鱈ch g狸 th棚m.
4 2
2 1y x x=  +( ).C
( ).C
( )C
2
2sin sin 3 0x x m+ +  =
3m =
m
4 5 6 7
(1 )z i i i i= + + + +
2
1 2
2
log (5 10) log ( 6 8) 0x x x+ + + + =
3
2
0
cos
xdx
I
x

= 
2a 5a=2 2a
4 0x y z   =
5R =
( )( )
( )
2 2
3 23
1 4 1
2 5 5 2 6 1 10
x x y y
y y x x
錚 + + + + =錚
錚
錚 +   = + +錚 , ,a b c 1a b c+ + = 0.ab bc ca+ + >2 2 2 5
P
a b b c c a ab bc ca
= + + +
   + +
TR働畛NG THPT TRI畛U SN 3 H働畛NG D畉N CH畉M
M担n: TON (L畉n 3 nm h畛c 2014-2015)
C但u
H動畛ng d畉n ch畉m
i畛
m
C但u 1
(2,0
i畛m)
a. (1,0 i畛m) Kh畉o s叩t H畛c sinh lm 炭ng quy tr狸nh, v畉 炭ng 畛 th畛 1,0
b. V畛i x = -2 suy ra y = 9; y = -24 0,5
PTTT l: y = -24(x + 2) + 9 hay y = -24x - 39. 0,5
C但u 2
(1,0
i畛m)
a. Khi m = 3
PT tr畛 thnh:
0,25
V畉y PT c坦 3 h畛
nghi畛m l
0,25
b. 畉t ; PT tr畛 thnh (*)
畛 PT 達 cho c坦 nghi畛m th狸
(*) ph畉i c坦 nghi畛m thu畛c
0,25
Kh畉o s叩t hm ta c坦
Suy ra 畛 th畛a m達n bi
to叩n th狸 0,25
C但u 3
(1,0
i畛m)
a. Ta c坦 0,25
Suy ra z c坦 ph畉n th畛c l a=8; ph畉n 畉o l b=-7.
0,25
b. K: x>-2. 0,25
So s叩nh v畛i K suy ra x=1.
0,25
C但u 4
(1,0
i畛m)
a. 畉t 0,25
Suy ra I=
0,25
b. S畛 t畉p con c坦 k ph畉n t畛 c畛a A l .
Gi畉 s畛 lo畉i t畉p con c坦 k ph畉n t畛
l lo畉i t畉p con nhi畛u nh畉t c畛a A
th狸 ta c坦 h畛:
0,25
Gi畉i h畛 b畉t PT tr棚n ta 動畛c k= 25.
V畉y t畉p A c坦 t畛i a t畉p con c坦 s畛 ph畉n t畛 b畉ng nhau.
0,25
2
sin 0
2sin sin 0 21
6sin
2 7
2
6
x k
x
x x x k
x
x k





錚
錚 =
=錚 錚
錚 錚+ =   = +
錚 錚=
錚 錚
錚 = +
錚
7
; 2 ; 2
6 6
x k x k x k
 
  

= = + = +
[ ]sin , 1;1x t t=  2
2 3t t m+  = 
[ ]1;1
[ ]2
( ) 2 3, 1;1f t t t t= +   25
minf( ) ; ax ( ) 0
8
t M f t

= =
25 25
;0 0;
8 8
m m
錚 錚 錚 錚
   錚 錚 錚 錚削0 錚 錚 錚
34 5 6 7 2 2 2 2 2 3 2
(1 ) ( ) .( ) ( ) (1 ) (1 )z i i i i i i i i i i錚 錚= + + + + = + + + + +錚 錚
[ ]
32 2 3
( 1) .( 1) ( 1) (1 ) 2 1 1 (1 )( 8 ) 8 8 8 7i i i i i i i i i=  +  +  + + = +  + +  =  + = 
2
2 2log (5 10) log ( 6 8) 0PT x x x  + + + + =
2 2
2 2log (5 10) log ( 6 8) 5 10 6 8 2; 1x x x x x x x x + = + +  + = + +  =  =
2
tan
cos
x u
dx du
dx
v xdv
x
=錚
=錚縁4
錚 錚
== 錚鰹4錚3
3 3
0 0
0
3 3
.tan tan ln cos ln 2
3 3
x x xdx x

 
 
 = + = 
50
k
C
1
50 50
1
50 50
k k
k k
C C
C C

+
錚 わ4
錚
わ4錚
25
50C
C但u 5
(1,0
i畛m)
a. V狸 tam gi叩c SAB 畛u n棚n SHAB.
V狸 (SAB) (ABCD) n棚n SH(ABCD) T畛 坦 suy ra SHCD (pcm)
0,25
0,25
b. Trong tam gi叩c 畛u ABC c畉nh ta c坦 SH=.
K畉 DMHC DM(SHC) suy ra DM=; k辿o di CH c畉t AD t畉i E.
Trong tam gi叩c vu担ng SHC c坦 HC=,
Trong tam gi叩c vu担ng BHC c坦 BC= g坦c HCB=450
g坦c CED=450
Suy ra tam gi叩c DME vu担ng c但n t畉i M EM=DM=ED=.
M EA=AH= AD= suy ra di畛n t鱈ch h狸nh thang ABCD =
V畉y (vtt)
0,25
0,25
C但u 6
(1,0
i畛m)
a. M畉t ph畉ng trung tr畛c (Q) c畛a
AB i qua trung i畛m 則 c畛a AB
v nh畉n 則 lm v辿c t董 ph叩p tuy畉n, n棚n (Q) : x+z-1=0
0,25
0,25
b. G畛i (d) l giao tuy畉n c畛a (P)
v (Q) suy ra (d):
Nh畉n th畉y AB//(P) v (Q) l mp
trung tr畛c c畛a AB n棚n i畛m C
c畉n t狸m n畉m tr棚n (d). G畛i C=(1+t; -3+2t; -t)
畛 tam gi叩c ABC vu担ng c但n
t畉i C th狸 2;
Suy ra c坦 2 i畛m C th畛a m達n l
v
0,25
0,25
C但u 7
(1,0
i畛m)
G畛i D l trung i畛m BC, g畛i I l t但m 動畛ng tr嘆n
ngo畉i ti畉p tam gi叩c ABC.
Ta c坦 AH=2.ID; g坦c DIC=g坦c BAC=600;
IC=R=則
Suy ra ID=IC.cos600 =則則AH=2.ID=則 (*)
V狸 H thu畛c (d): x-y-1=0 n棚n H=(t; t-1).
0,25
0,25

モモ
2a3a
モ2 2a
2a
a
2 2a4a
a3a2
4a
3
.
1 4 . 3
.
3 3
S ABCD ABCD
a
V SH dt= =
7 5
( ;3; )
2 2
I
(3;0;3)AB =
uuur
1
3 2
x t
y t
z t
= +錚
錚
=  +錚
錚 = 錚
. 0AC BC t=  =
uuur uuur
11
3
t =
(3;1; 2)C = 14 13 11
( ; ; )
3 3 3
C

=
5
5
2
5
H
S
B
A
C
D
M
E
O
A
CB
H
A'
D
Thay vo (*) suy ra t=0 v t=3. Suy ra H=(0;-1) v H=(3;2)
BC i qua M(-1;2) v nh畉n v辿c t董 lm v辿c t董 ph叩p tuy畉n n棚n BC c坦 PT:
x+2y-3=0 v 2x+y=0.
0,25
0,25
C但u 8
(1,0
i畛m)
T畛 PT 畉u c畛a h畛 ta c坦 :
則
則
0,25
T畛 (1) v (2) suy ra 0,25
Th畉 vo PT
th畛 2 c畛a
h畛 ta 動畛c:
0,25
X辿t hm s畛 f(y)= tr棚n R.
c坦 f(y)= >0 v畛i m畛i y
Suy ra PT c坦 nghi畛m duy
nh畉t y=. V畉y h畛 c坦 nghi畛m
duy nh畉t (0;-3/2)
0,25
C但u 9
(1,0
i畛m)
Kh担ng m但t tinh t担ng quat ta co th棚 gia s動 a > b > c. Khi o :
A = . 0,25
S動 du味ng b但t ng th動c :
ng th動c xay ra khi m
= n. Ta co:
= (1)
0,25
la味i co: suy ra: (2)
T動 ( 1) va ( 2) ta co :
A .
0,25
ng th動c xay ra khi: a -
b = b c, 3 - 3b = 1 + 3b
va a+ b + c = 1 ho味c cac
hoan vi味.
V畉y GTNN cua A la
0,25
Ch炭 箪:
- N畉u h畛c sinh lm b畉ng c叩ch kh叩c nh動ng 炭ng th狸 v畉n ch畉m i畛m t畛i a theo t畛ng 箪.
- N畉u C但u 5, h畛c sinh kh担ng v畉 h狸nh ho畉c v畉 sai c董 b畉n th狸 kh担ng ch畉m i畛m.
- N畉u trong m畛t bi m k畉t qu畉 箪 tr動畛c 動畛c s畛 d畛ng 畛 gi畉i 箪 sau, m 箪 tr動畛c b畛 sai
ho畉c ch動a lm th狸 箪 sau s畉 kh担ng 動畛c ch畉m i畛m.
.H畉t.
AH
uuur
( )( )2 2 2 2
1 4 1 4 1 (1)x x y y y y x x+ + + + =  + + = + 
( )( ) ( ) ( )2 2 2 2 2
2
4
1 4 1 1 1 4 1 4 (2)
4
x x y y x x x x y y
y y
+ + + + =  + + =  + + = + 
+ 
2
2 3 1 5y x x = + +
3 33 3(2 5) 5 2 4 (2 5) 4 5 2 0 (*)y y y y y y+   =   + +   =
3 3(2 5) 4 5 2y y y+ +  
2
23
2
6(2 5) 4
(5 2 )
y
y
+ + +

5
2

3
2
 0x =
2 2 2 5
a b b c a c ab bc ca
+ + +
   + +
2 2
1 1 4 2 2
( , 0)m n
m n m n m n
+   >
+ +
1 1 2 5 10 10
2( )
2a b b c a c a cab bc ca ab bc ca
+ + +  +
   + + + +
( ) ( ) ( )2
20 2 20 2
4( ) 4 a c a c ba c ab bc ca
 =
+ + + + + +( ) ( )
20 2
1 1 3b b +
2
(3 3 1 3 )
3(1 )(1 3 ) 4
4
b b
b b
 + +
 +  =( ) ( )
2 3
1 1 3
3
b b + 
10 6
2 6 1 2 6
, ,
6 3 6
a b c
+ 
 = = =
10 6

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De thi-thu-thpt-quoc-gia-mon-toan-lan-3-nam-2015-truong-thpt-trieu-son-3

  • 1. TR働畛NG THPT TRI畛U SN 3 畛 CHNH TH畛C 畛 KI畛M TRA KI畉N TH畛C THI THPT QU畛C GIA NM H畛C 2014-2015 (L畉n 3) MN TON Th畛i gian lm bi 180 ph炭t C但u 1 (2,0 i畛m) Cho hm s畛 c坦 畛 th畛 l a. Kh畉o s叩t s畛 bi畉n thi棚n c畛a hm s畛 v v畉 畛 th畛 b. Vi畉t ph動董ng tr狸nh ti畉p tuy畉n c畛a 畛 th畛 t畉i i畛m c坦 honh 畛 b畉ng -2. C但u 2 (1,0 i畛m) Cho ph動董ng tr狸nh: a. Gi畉i ph動董ng tr狸nh khi b. T狸m 畛 ph動董ng tr狸nh 達 cho c坦 nghi畛m. C但u 3 (1,0 i畛m) a. T狸m ph畉n th畛c v ph畉n 畉o c畛a s畛 ph畛c b. Gi畉i ph動董ng tr狸nh C但u 4 (1,0 i畛m) a. T鱈nh t鱈ch ph但n: b. Cho t畉p h畛p A c坦 50 ph畉n t畛. H畛i t畉p A c坦 t畛i a bao nhi棚u t畉p h畛p con c坦 s畛 ph畉n t畛 b畉ng nhau? C但u 5 (1,0 i畛m) Cho h狸nh ch坦p S.ABCD c坦 ABCD l h狸nh thang vu担ng t畉i A v B, c畉nh BC l 叩y nh畛. G畛i H l trung i畛m c畉nh AB, tam gi叩c SAB l tam gi叩c 畛u c畉nh , m畉t ph畉ng (SAB) vu担ng g坦c v畛i (ABCD). Cho SC v kho畉ng c叩ch t畛 D 畉n m畉t ph畉ng (SHC) l . a. Ch畛ng minh r畉ng SH vu担ng g坦c v畛i CD b. T鱈nh th畛 t鱈ch c畛a kh畛i ch坦p S.ABCD C但u 6 (1,0 i畛m) Trong kh担ng gian v畛i h畛 tr畛c t畛a 畛 Oxyz, cho m畉t ph畉ng (P): v c叩c i畛m A(2; 3;- 4), B(5; 3;- 1) a. Vi畉t ph動董ng tr狸nh m畉t ph畉ng trung tr畛c c畛a o畉n AB b. T狸m t畛a 畛 i畛m M thu畛c (P) sao cho tam gi叩c AMB vu担ng c但n t畉i M. C但u 7 (1,0 i畛m) Trong m畉t ph畉ng t畛a 畛 Oxy, cho tam gi叩c ABC c坦 A(1; 1), g坦c BAC b畉ng 600 v n畛i ti畉p trong 動畛ng tr嘆n c坦 b叩n k鱈nh . Vi畉t ph動董ng tr狸nh 動畛ng th畉ng BC, bi畉t 動畛ng th畉ng BC i qua M(-1; 2) v tr畛c t但m H c畛a tam gi叩c ABC n畉m tr棚n 動畛ng th畉ng (d): x-y-1=0. C但u 8 (1,0 i畛m) Gi畉i h畛 ph動董ng tr狸nh C但u 9 (1,0 i畛m) Cho la cac s担 th動味c thoa man va Tim gia tr畛 nho nh但t cua bi棚u th動c: . ..................H畉t................. Ch炭 箪: Th鱈 sinh kh担ng 動畛c s畛 d畛ng ti li畛u, kh担ng 動畛c trao 畛i bi. Gi叩m th畛 kh担ng gi畉i th鱈ch g狸 th棚m. 4 2 2 1y x x= +( ).C ( ).C ( )C 2 2sin sin 3 0x x m+ + = 3m = m 4 5 6 7 (1 )z i i i i= + + + + 2 1 2 2 log (5 10) log ( 6 8) 0x x x+ + + + = 3 2 0 cos xdx I x = 2a 5a=2 2a 4 0x y z = 5R = ( )( ) ( ) 2 2 3 23 1 4 1 2 5 5 2 6 1 10 x x y y y y x x 錚 + + + + =錚 錚 錚 + = + +錚 , ,a b c 1a b c+ + = 0.ab bc ca+ + >2 2 2 5 P a b b c c a ab bc ca = + + + + +
  • 2. TR働畛NG THPT TRI畛U SN 3 H働畛NG D畉N CH畉M M担n: TON (L畉n 3 nm h畛c 2014-2015) C但u H動畛ng d畉n ch畉m i畛 m C但u 1 (2,0 i畛m) a. (1,0 i畛m) Kh畉o s叩t H畛c sinh lm 炭ng quy tr狸nh, v畉 炭ng 畛 th畛 1,0 b. V畛i x = -2 suy ra y = 9; y = -24 0,5 PTTT l: y = -24(x + 2) + 9 hay y = -24x - 39. 0,5 C但u 2 (1,0 i畛m) a. Khi m = 3 PT tr畛 thnh: 0,25 V畉y PT c坦 3 h畛 nghi畛m l 0,25 b. 畉t ; PT tr畛 thnh (*) 畛 PT 達 cho c坦 nghi畛m th狸 (*) ph畉i c坦 nghi畛m thu畛c 0,25 Kh畉o s叩t hm ta c坦 Suy ra 畛 th畛a m達n bi to叩n th狸 0,25 C但u 3 (1,0 i畛m) a. Ta c坦 0,25 Suy ra z c坦 ph畉n th畛c l a=8; ph畉n 畉o l b=-7. 0,25 b. K: x>-2. 0,25 So s叩nh v畛i K suy ra x=1. 0,25 C但u 4 (1,0 i畛m) a. 畉t 0,25 Suy ra I= 0,25 b. S畛 t畉p con c坦 k ph畉n t畛 c畛a A l . Gi畉 s畛 lo畉i t畉p con c坦 k ph畉n t畛 l lo畉i t畉p con nhi畛u nh畉t c畛a A th狸 ta c坦 h畛: 0,25 Gi畉i h畛 b畉t PT tr棚n ta 動畛c k= 25. V畉y t畉p A c坦 t畛i a t畉p con c坦 s畛 ph畉n t畛 b畉ng nhau. 0,25 2 sin 0 2sin sin 0 21 6sin 2 7 2 6 x k x x x x k x x k 錚 錚 = =錚 錚 錚 錚+ = = + 錚 錚= 錚 錚 錚 = + 錚 7 ; 2 ; 2 6 6 x k x k x k = = + = + [ ]sin , 1;1x t t= 2 2 3t t m+ = [ ]1;1 [ ]2 ( ) 2 3, 1;1f t t t t= + 25 minf( ) ; ax ( ) 0 8 t M f t = = 25 25 ;0 0; 8 8 m m 錚 錚 錚 錚 錚 錚 錚 錚削0 錚 錚 錚 34 5 6 7 2 2 2 2 2 3 2 (1 ) ( ) .( ) ( ) (1 ) (1 )z i i i i i i i i i i錚 錚= + + + + = + + + + +錚 錚 [ ] 32 2 3 ( 1) .( 1) ( 1) (1 ) 2 1 1 (1 )( 8 ) 8 8 8 7i i i i i i i i i= + + + + = + + + = + = 2 2 2log (5 10) log ( 6 8) 0PT x x x + + + + = 2 2 2 2log (5 10) log ( 6 8) 5 10 6 8 2; 1x x x x x x x x + = + + + = + + = = 2 tan cos x u dx du dx v xdv x =錚 =錚縁4 錚 錚 == 錚鰹4錚3 3 3 0 0 0 3 3 .tan tan ln cos ln 2 3 3 x x xdx x = + = 50 k C 1 50 50 1 50 50 k k k k C C C C + 錚 わ4 錚 わ4錚 25 50C
  • 3. C但u 5 (1,0 i畛m) a. V狸 tam gi叩c SAB 畛u n棚n SHAB. V狸 (SAB) (ABCD) n棚n SH(ABCD) T畛 坦 suy ra SHCD (pcm) 0,25 0,25 b. Trong tam gi叩c 畛u ABC c畉nh ta c坦 SH=. K畉 DMHC DM(SHC) suy ra DM=; k辿o di CH c畉t AD t畉i E. Trong tam gi叩c vu担ng SHC c坦 HC=, Trong tam gi叩c vu担ng BHC c坦 BC= g坦c HCB=450 g坦c CED=450 Suy ra tam gi叩c DME vu担ng c但n t畉i M EM=DM=ED=. M EA=AH= AD= suy ra di畛n t鱈ch h狸nh thang ABCD = V畉y (vtt) 0,25 0,25 C但u 6 (1,0 i畛m) a. M畉t ph畉ng trung tr畛c (Q) c畛a AB i qua trung i畛m 則 c畛a AB v nh畉n 則 lm v辿c t董 ph叩p tuy畉n, n棚n (Q) : x+z-1=0 0,25 0,25 b. G畛i (d) l giao tuy畉n c畛a (P) v (Q) suy ra (d): Nh畉n th畉y AB//(P) v (Q) l mp trung tr畛c c畛a AB n棚n i畛m C c畉n t狸m n畉m tr棚n (d). G畛i C=(1+t; -3+2t; -t) 畛 tam gi叩c ABC vu担ng c但n t畉i C th狸 2; Suy ra c坦 2 i畛m C th畛a m達n l v 0,25 0,25 C但u 7 (1,0 i畛m) G畛i D l trung i畛m BC, g畛i I l t但m 動畛ng tr嘆n ngo畉i ti畉p tam gi叩c ABC. Ta c坦 AH=2.ID; g坦c DIC=g坦c BAC=600; IC=R=則 Suy ra ID=IC.cos600 =則則AH=2.ID=則 (*) V狸 H thu畛c (d): x-y-1=0 n棚n H=(t; t-1). 0,25 0,25 モモ 2a3a モ2 2a 2a a 2 2a4a a3a2 4a 3 . 1 4 . 3 . 3 3 S ABCD ABCD a V SH dt= = 7 5 ( ;3; ) 2 2 I (3;0;3)AB = uuur 1 3 2 x t y t z t = +錚 錚 = +錚 錚 = 錚 . 0AC BC t= = uuur uuur 11 3 t = (3;1; 2)C = 14 13 11 ( ; ; ) 3 3 3 C = 5 5 2 5 H S B A C D M E O A CB H A' D
  • 4. Thay vo (*) suy ra t=0 v t=3. Suy ra H=(0;-1) v H=(3;2) BC i qua M(-1;2) v nh畉n v辿c t董 lm v辿c t董 ph叩p tuy畉n n棚n BC c坦 PT: x+2y-3=0 v 2x+y=0. 0,25 0,25 C但u 8 (1,0 i畛m) T畛 PT 畉u c畛a h畛 ta c坦 : 則 則 0,25 T畛 (1) v (2) suy ra 0,25 Th畉 vo PT th畛 2 c畛a h畛 ta 動畛c: 0,25 X辿t hm s畛 f(y)= tr棚n R. c坦 f(y)= >0 v畛i m畛i y Suy ra PT c坦 nghi畛m duy nh畉t y=. V畉y h畛 c坦 nghi畛m duy nh畉t (0;-3/2) 0,25 C但u 9 (1,0 i畛m) Kh担ng m但t tinh t担ng quat ta co th棚 gia s動 a > b > c. Khi o : A = . 0,25 S動 du味ng b但t ng th動c : ng th動c xay ra khi m = n. Ta co: = (1) 0,25 la味i co: suy ra: (2) T動 ( 1) va ( 2) ta co : A . 0,25 ng th動c xay ra khi: a - b = b c, 3 - 3b = 1 + 3b va a+ b + c = 1 ho味c cac hoan vi味. V畉y GTNN cua A la 0,25 Ch炭 箪: - N畉u h畛c sinh lm b畉ng c叩ch kh叩c nh動ng 炭ng th狸 v畉n ch畉m i畛m t畛i a theo t畛ng 箪. - N畉u C但u 5, h畛c sinh kh担ng v畉 h狸nh ho畉c v畉 sai c董 b畉n th狸 kh担ng ch畉m i畛m. - N畉u trong m畛t bi m k畉t qu畉 箪 tr動畛c 動畛c s畛 d畛ng 畛 gi畉i 箪 sau, m 箪 tr動畛c b畛 sai ho畉c ch動a lm th狸 箪 sau s畉 kh担ng 動畛c ch畉m i畛m. .H畉t. AH uuur ( )( )2 2 2 2 1 4 1 4 1 (1)x x y y y y x x+ + + + = + + = + ( )( ) ( ) ( )2 2 2 2 2 2 4 1 4 1 1 1 4 1 4 (2) 4 x x y y x x x x y y y y + + + + = + + = + + = + + 2 2 3 1 5y x x = + + 3 33 3(2 5) 5 2 4 (2 5) 4 5 2 0 (*)y y y y y y+ = + + = 3 3(2 5) 4 5 2y y y+ + 2 23 2 6(2 5) 4 (5 2 ) y y + + + 5 2 3 2 0x = 2 2 2 5 a b b c a c ab bc ca + + + + + 2 2 1 1 4 2 2 ( , 0)m n m n m n m n + > + + 1 1 2 5 10 10 2( ) 2a b b c a c a cab bc ca ab bc ca + + + + + + + + ( ) ( ) ( )2 20 2 20 2 4( ) 4 a c a c ba c ab bc ca = + + + + + +( ) ( ) 20 2 1 1 3b b + 2 (3 3 1 3 ) 3(1 )(1 3 ) 4 4 b b b b + + + =( ) ( ) 2 3 1 1 3 3 b b + 10 6 2 6 1 2 6 , , 6 3 6 a b c + = = = 10 6