Đáp án:
`1/2x (x^2 - x+1) - (1/2x - 1)(x+1) = 1/2 x^3 - x^2 + x + 1`
Giải thích các bước giải:
`1/2x (x^2 - x+1) - (1/2x - 1)(x+1)`
`= 1/2x . x^2 - 1/2 x . x + 1/2 x.1 - (1/2 x . x + 1/2 x . 1 - 1 . x - 1.1)`
` = 1/2 x^3 - 1/2 x^2 + 1/2 x - (1/2 x^2 + 1/2 x - x - 1)`
` = 1/2 x^3 - 1/2 x^2 + 1/2x - 1/2 x^2- 1/2x + x + 1`
` = 1/2 x^3 - (1/2 x^2 + 1/2 x^2) + (1/2 x - 1/2 x + x) + 1`
`= 1/2 x^3 - x^2 + x + 1`