Bài 1:
2
2 2
a) y 1 0
u 1
3 2
v 1
1
x
u x y 1, v
u v
y
u 9
u 2v 3
v 3
, , , ,
1 1 1 1
ỉ
2 x x 1
2 2
2
x 1 x 1
2 2
x 1
2
b)
log 2x 1 2 log 2x 1 4 0 1
log 2x 1 2 0 log 2x 1 2 0
1
log 2x 1 2
2
h̃ Ư
;
1
f 0 .f 0
2
2
2
y' 3 x 2mx m 1
y' 0 x 2mx m 1 0 3
1 2
x x 4
2
2
2
2
2
1 2 1 2
' m m 1 0
m m 1 0
m m 5 0
m m 5 0
x x 4x x 16
1 21 1 21
m ; ;
2 2