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hpc
dfi
j,
ttrdly!
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HA Ngr
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ni
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s6t sp bi6n
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i b))Chr:ng
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ri
tail{11,A
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Gidi
phuo'ng
trinh
,
2cos3x
*
cos2x
*
sinx
:
0.
CAu 3
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4x +
7+ 1)
tx(./x,
+ S
+
1)
:
6
.
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.i
Cdu +\f,O
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Tim
t6t c,?it cin
s6
hpng nguydn
trong khai tri€n
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r'
/
rdpg
S.4
:
SB
=.9C
vd
g<ic
gita
rlud'ng
ihltng SA vd m{t
ph[ng
{ABC)
b[ng
60'" T'fnh theo c
th6
tich cira
khOichOp
S.AtsC.
,
CAu
6
{1,0
iliim}.
C6c s5 thgc
x,
y
thay dOi tliOa tmdny,+
y
:7.
Tirn
gi6
tri
16n nhht cfiabi€u thfrc
:
\ ''
P:
(x'+
l)(y'+
l).
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PIIAN
nffiroC
{3,8
cti6nl:
Th{ sinh
chi dwqc ldne wQt trong
hai
phitn
riilng
{phfrn
A
hagic
ptfin
B)
A. Theo
chuong
trinh Chu6n
,
Cdu
7.a
(1,0
di6m).
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m{t
phdng
v5'i hQ toa d$
Oxy,
cho hai
diOm A(-5;
1l), B(7;7) v}r hai
<ludng thlng
d1
: 2x-y-
1
:0,
dz: x+3y
-4
:
0.
Tim
toa
d$ di€m
C thu6c
r{ vi di6m D ihudc
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tri
gi6c
AB;CD
ld hinh
binh
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Oxy,chohaiduo'ngtron (C1):
x2+y2-2x+2y-2:Avit
(C2)
:
x2
+
y'
+
2x
-
4y
:
0. Ei€m A(
1; l)
ld rnQt
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phu'o'ng
trinh
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thdng
di
qua
A cfit(Cr),
(Cz)
l6n 1u9t
tai B
vit C
kh6c
phfa
vd'i
A saa
cho
AC
:
2AB.
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(1,{}
diAn$"
Tim
giS
tri
nhO
nhSt
cLia ft? sae cho tr€n
d0 th!
cira hdin
s5
f(x)
:
*
tOn tai
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tqri d6 cdc
ti6p tuy6n cdra
AO tni song song v6'i nhau
vd
khodng c6ch
gifr'a
cqip diOni ndy bing rr
.
li, Thro
clru'e,ing
trlrrh
N*rrg
eao
'ijf;.u
7"b
{t,{}
difwt}.
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phing.r,j!h0ica
iffi C:ty,cttt:3
rlLi.i'nglhdnlr
rr]r:x
+
\'-?:A;t!1)s.
-\'+
l:
(i
vit
$
:3x
y
-
5
:
0. Tini tga dQ c6c dinh hinh vudrrg
ABCD, bi6t
rang A.
C €.
c/t,
B€
clz, Ce dz.
Cflu
8.b
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Trong mlt
phdng
v6i hQ tqa dQ Oxy, clto
di€n M(-
1; 0)
vi dud'ng trdn
(Q
c6
phtLong
irinh
rt
*
y'-
8x
-
4y
-
16:
0.Vi6t
phu'o'ng
trinh dudrrg thing di
qua
M
cit(C)
theo
dAy
cung AB ng*n
nlfit.
Cdu
9.b
(1,0
di6*e).Tim
ciic
gi6
trl c&amde tr6n
d6 tn1 cria
hdni sd f(x)
=
x*2
*:l
.O hai
di€m
-41r(x,;
yr)
va
x_
!
Mz(xz
y2)
sao
cho
x1
*
yr
=
x2
*
lz
=
ri . Tu d6 chri'ng rninh
ring
iuft,
M
cirng
thuOc
m6t nhdnh cria
dd
thl
;.
-*
nam so da cno.
V'lai
sinlt
kitdng dwqc sir dqrng
titi
liQw, cdn b$ coi thi kh0ng
gidi
tlr{t:h
gi
tltdm.
Hq
vi t6n thi
sinh
SO b:io
danh;
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