DB
rHI
THtrDAr Hec
rAx
r NAtrr
2or3
Mdn:
TOAN;
Kh0i:
B
;D
Thdi
gian
ldm
bdi: I B0
phut,
khdng ke
thdt
gian
phdt
di
pHArv
cHUNG
cHo
rAr cA rni srNu
g,a
aEmS
Cf,u I
Q,O
Afem)Cho
hdm sd

(2,0
ctidm)
I
sin 2x
-
zsin
x.
I
.
Giei
phucrng trinh:
r
tan.r
+

,12
sin
.r
+
cos.r
dudng
tron
(T):
xz
+
y'
-
x-9y+18
=
0

g,O
mdml
Cho hinh ch6p
S.ABCD
c6 tf6y
ln hinh vu6ng
cgnh
a, hinh
chitiu vuOng
g6c
cria
Sten
d6y trirng vdi trgng
tam cria
tam
giric
ABD, c4nh
SB tp voi il6y mQt
g6c
60". Tinh the
tfch khdi ch6p
S.ABCDvd
khoang c6ch
giiia
hai dutmg
thing
SA, CD.
'
Cfl,+V
lt,OAid^)Choc6cstith$cayth6amdndiAuki$n

pxy,
cho tam
gi6c
ABC. c6
ttinh A(3;
4),
trgc
tdm H(l
;
3)
vd t6m
.
ducrng
trdn ngogi
tii5p l(2;
O;. Vii5t
phuong
trinh
ttuong
thing BC.
2.
Trong
khdng
gian
vOi
hQ tqa
dQ Oxyz,
cho
cdc
tli6m e1t;

chu{rng
frinh
Neng cao
Cfiu
VI.b
(2,0
iti6m)
l.
Trong
m[t
phing vdi
he
tga d0
Oxy,
cho
A(4;t),
B(3;
-l).
Gsi C,
D
li
hai
di6m
thu$c
trinh
duong
th[ng
CD.
in
e

Tam
gi6c
ABC
c6 dinh
A(-l
;2;
l'), o6c
dirrh
B,
c
nim
tr6n
(P)
vd trgng
tiim
G
nim
tr0n d.
Tfnh
dO
dei ducrngtrung
tuy6n
cia
tam
gi6c
ABC
kd tir tlinh
A.
Cf,u
VII.b