Tr€n rnot vE tia Ax sao cho CA.. Chung rninh ACDE ld hinh thoi.. Ggi d ld dudng thing di qua A kh6ng c6t c4nh BC.. X6c dinh vitri di6m M tr€n dudng thing d sao cho chu vi AMBC nh6 nhdt..
Trang 1I } [ [ O N G G I A O I ) T ] C ]
I ' I I A N I I P I I O
V A D A O
V I N I I
r4C) f } E K [ [ A { } SA'I- CTTAT'E-I-1"#N{J F E O C S [ ] * * ' F { { ; H { } E
N A V I I I O C 2tkt2 - 2CI13
l\46m thfr: Tqlrlar lo'p I ' i - l r o i
g i a r r la i l t r a i : l 2 { } p f u u t
C T I I N Ht'r r ir'c
r ) : : r
D t i l [
.)
c a "
(4 die i ti'y
y : c z * a x ; z - a x *
+ _ + _ _ /
1 + a 1 + b 7 + c
L
Zalx*al *r
,\
Bii 2: (5 diAm)
a Voi a, b la cac s6 nguy6n Chung rr-rinh
c h o 5 t h i a o - b o c h i a h6t cho 5
b Tini s6 du' trong phep chia cua bieu thuc
d a t h u c * ' + 8 x + 1 2
b y v a x * y ' + r , , + 0
(a la hang so)
r d n g n 6 u 4 a ' + 3 a b - 1 1 b 2 c h i a het ( x + 1 ) ( x + 3 X r - 5 ) ( x + 7 ) + 2 0 1 3 c h o
Bii 3: Q di)m)
Cho * I 0, y > 0 thoa mdn r' + y' : x - y Tim gia tri lon
t h u c A - x 2 + y 2
Bii 4: -(6 diAm)
-.,,^r
Cho AABC c6n tai A ( A < 600 ) Tr€n rnot
vE tia Ax sao cho CA - iaB Goi E ld di6m d6i
a Chung rninh ACDE ld hinh thoi
b Chuns minh: AI(.BA - BK.AI
c Ggi d ld dudng thing di qua A kh6ng c6t c4nh BC X6c dinh vitri di6m M tr€n dudng thing d sao cho chu vi AMBC nh6 nhdt.
Bii 5: (2 di€m)
Cho irinh vu6ng
vu6ng goc voi AM tai
nhAt
\
ABCD co canh bdng 1 M
M cft canh CD tai N Tirn
n h A t c u a c u a b i e u
tai I vd K
diem ndm tr6n doan BC Duong tri cliem M Ae CX co do dai lo'n
1d
v i
FIet