( )( )X 3 2 X 3X 2 X 3− +→− →−+ − X X 6= = −2 2(0.75 0.25Đ...
Câu 31
( )( )
x 3 2 x 3
x 2 x 3
− +
→− →−
+ −
x x 6
= = −
2 2
(0.75
0.25đ
lim →− x 2 5
−
điểm)
x 3
′ ′
( ) ( ) ( ) ( )2x 3 x x 3 2x 3 x x 3
+ + + − + + +
y x
= +
⇒ = ′
a/
2