( )( )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

2 3

y