CHO 1   1  DF X  G X XF X X  G X X D 2; D 300 0A. 5 ....

Câu 2. Cho 1   1  

d

f xg x x

f x xg x x

d 2; d 3

0

0 0

A. 5 . B. 7 . C. 8 . D. 6 .