TA CÓ        F X2 3 F X   2 3F X DX X DX F X X X C    ...

Câu 44: Ta có        

f x

2 3 f x   2 3

f x dx x dx f x x x C

 

      

  ^.

2

   ^{2 3}  ^ln   ^{2 3 2}

Thay x  0 ta có: ^ln   ^{0 ln1 0 ln}   ^{2 3 2}

f   C    C f x  x  2 x .

1

Mà   ^{0, ln}   ^{2 3 2}

1 1

1 2

f x    x   f x  x  2 x . Thay x  1 ta có    

f   2 f  e .