NẾU F X DX 1 LN 5X C X 1 1.1 LN 5 .1 1 .   C.   2A.  ...

Câu 17: Nếu f x

 

dx 1 ln 5x C x 1 1.1 ln 5 .1 1 .   C.

 

2

A.

 

1 .f x  xx D.

 

2

 

f x xf x 5f x x 5  x B.

 

2

x xx