Bài 7: Thực hiện phép tính .

`a)` `( x - 4x^2 + 6x^3 ) : 2x

`=` `x/2x - 4x^2/2x + 6x^3/2x`

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

`b)` `( x^3 - 3x^2 + 5x ) : ( - 1/3x )`

`=` `x^3 / $\frac{- 1}{3x}$  `-` 3x^2 / $\frac{- 1}{3x}$ `+` 5x / $\frac{- 1}{3x}$`

`=` `- 3x^2 + 9x - 15`

`c).` `( 9x^2 - 4 ) : ( 3x + 2 )`

`=` `( 3x - 2 )( 3x + 2 ) : ( 3x + 2 )`

`=` `3x - 2`

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