đề thi thử trường nguyễn huệ

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te
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Cf;u
tr:
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Cho hdm
s6
!
:
x3
-
3(n +7)x2
+
9x
*
m
,
v\i nt Id
tham
sO
thuc.
l. Kh6o s6t su bi6n thi6n
vd
ve
AO
tni cria hlm sO
Aa cho irng
voi nt:7.
2.
Xic
dinh nt dd

hem
sO
Oa
cho dat'cuc tri tqi rr,)r? sao c.iro
lx,
-
rrl=2.
C6u
X{:
(.2,8
dihwe)
1.
,
Giai
phuo'ng
trinh:
2.
Giai
he
phuong
trinh:
'.'
I
+
3
cosr;
+ cos
2x
-2cos3x
=

4sin
x.sin 2x
f:-ra
].'t
*
t). +
Y-
* 1
:J:-r-l'
l.xy
+:r
+zv
=1
(x'
Ye
R)
Csu
EEE:
(f,8
di\m)
T\tn
f :f ox
sinx.sinl
"
-t
'.
I
\
4,/
C6u

EV:
(1,8
di6mc)
Cho lang
tru
tain
gi6c
ABC.ATBTCT c6 tdt
ch cdc
canh bAng a.
g5c
tao bdi
canh
bon
rzd
md'r
phing
d6y'oang
300. Flinh chieu H
cira
didin
A tron
mat
ph&ng
(ArBrCi)
rhuOc
dubng thing
8,C,. Tinh thd tich
khdi 16ng tru ABC.ATB'C, vd
tfnh

khoang c6ch
gir-r'a
hai dubng
thing AA,
vlL
B,C,
theo
a.
C6u V:
(I,ff
dihree) ){et circ
sd thqc <lucrng
a, b,
c
th6a
mdn
didu kiOn
a + b +c
=
1 . Tim
gi6
tri
nho nh6t eri.a
:
r=
Ciiu VI
y2,t)
*i6rte'S
1. Trong mat
phing

v6i h0
toa
dd
Oxy
cho hai duo'ng
trdn
:
,
(lC1):
x2
+
f
.:13
vi
(C2): (x
:
6)t
+
y2
:25
cit trirau
tai A(Z:3).
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phuong
trinh duo'ng
th6ng di
qua
A va
ldn luryt
c5t

(C'), (Cz)
theo irai
dAy cung
phAn
bi6t
c6 dQ ddi
bdrrg
nhau.
2. Trong kh6ng
gian
vo'i hQ toa dQ Oxyz cho tam
giac
i,uong
cdn ABC
c6
A(5
;
3
;
- 1),
C
(2
;3 ;
-
ilvd
B
ld
ditim nirn tr6n rndt
phing
co

phucng
trinh
:
.
-^ ;.
lrm toa do cllern u.
CAU VII
Q,A
diAwt)
Giii
phuong
trinh :
A
(z-tog i-)iogn.3-;
:-
=l
l-
iog,
x
F{Ct
Thf sinh
kltong
duqc
sw dung
tdi !f.€u.
Cd"n
bc
coi tlti
kltong
giai

thich
gi
thenr
{r+-{+-)r:-l
BA
:
tsC. Bi6t
.x+y-z-6=4.
www.VNMATH.com
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FIQC
2010
-
20r
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pg
rril nnoN:
ToAN
KHoI
A,
ts
t
-6"t
+9x_1.
-12"r'f9:3(;r
-4x+3)
<0<=l<x<3.
=JX
Y6im=l
tac6
y=a
*
T4p
xiic dinh:
D
=
R
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n
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thi6n: y',
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bidn trOn
m6i
khoing
( ,1)
+
FIdm
sd nghich
bidn
tre-1
khoring-
(1,
3),
*
Cuc
tri:
H)m
sd dat
cuc
dai tai
x:1 r,b
va

(3,
+
*).
.''''' ''.'''''''''.''.'''''''''' ''''
lcn:
Y(1)
=
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dat
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:
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BAng
bidn thiOn:
Ta c6 yl;
3x2
*
6(y+
l)x
+- 9,
Him
sd dat
cuc
dai,
cuc
fid;
di
;;, ;;;
d,,*""g
tii"r,
t.=
0;
i;";;hie*
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ra
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,
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e
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xt
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c6
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ld
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l-'uT
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-
3
>
o
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|
r/?
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(l)
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V,
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e
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e 4(m
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+
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lm
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4,25

0.2
5
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x)
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-
sin x.sin 2x)
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2x
|
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3 co_s:r r,
9os2x
_

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:
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]
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c_os 2::
=
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fcos":
o
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I
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=

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thay
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l-
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dusc
(x;;r)
:
(1;0);
(x,y-)
:
(
1;7)
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ver nghi0m
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c6 2 nghiim
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:
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:
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f
l/T
lx:-*Kn
lr
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I
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+
+
K2tr
L3
(t^)^t
lt''
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f
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l-\.y+.\'*21,:l
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r 1')
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thiet
thi gdc

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J7
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x + rl)
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g5c
A,4,H
llgdc
AA.H bang
30('.
EI-?
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diem}
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di6m}
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www.VNMATH.com
X6t
tam
gi6c
vuOng
AHArc6
AA,

=
a, g6c
AA.H
=30"
=
v :lor,
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H
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r'd
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ld
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tirn
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AC
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BC:
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+(2*
x)2
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+
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+(z+l)2
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+
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l,.l
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