NẾU 5 ( )D 3F X X =D 9F X X =F X X522A. 3. B. 12. C. − 6. D. 6...

Câu 10: Nếu

5

( )

d 3

f x x =

d 9

f x x

5

2

A. 3. B. 12. C. − 6. D. 6.