Giải giúp em với âj!!!

Bài `2:`

`a) y = x^2 - 3x + 4`

`y' = 2x - 3`

`b) y = -1/3 x^3 + 2x^2 - x - 1`

`y' = -1/3 . 3x^2 + 2 . 2x - 1`

   ` = -x^2 + 4x - 1`

`c) y = x^5 + 6x^3 - 2x^2`

`y' = 5x^4 + 3 . 6x^2 - 2 . 2x`

   ` = 5x^4 + 18x^2 - 4x`

`d) y = (x + 3)(x - 1)`

`y' = (x + 3)' . (x - 1) + (x + 3) . (x - 1)'`

  ` = 1 . (x - 1) + 1 . (x + 3) = 2x + 2`

`e) y = (x + 2)/(x - 1)`

`y' = ( (x + 2)' . (x - 1) - (x + 2) . (x - 1)')/((x-1)^2)`

   ` = ( 1(x - 1) - 1(x + 2))/((x-1)^2) = -3/((x-1)^2)`