Đáp án:

Giải thích các bước giải:

Bài `4` : 

`1)`

` ( x + 1 ) ( x^2 - x + 1 ) `

`= ( x + 1 ) ( x^2 - x * 1 + 1^2 ) `

`= x^3 + 1 `

``

`2)`

` ( x - 1 ) ( x^2 + x + 1 ) `

`= ( x - 1 ) ( x^2 + x * 1 + 1^2 ) `

`= x^3 - 1 `

``

`3)`

` ( x - 2 ) ( x^2 + 2x + 4 ) `

`= ( x - 2 ) ( x^2 + x * 2 + 2^2 ) `

`= x^3 - 8 `

``

`4)`

` ( x + 2 ) ( x^2 - 2x + 4 ) `

`= ( x + 2 ) ( x^2 - x * 2 + 2^2 ) `

`= x^3 + 8 `

``

`5)`

` ( x - 3 ) ( x^2 + 3x + 9 ) `

`= ( x - 3 ) ( x^2 - x * 3 + 3^3 ) `

`= x^3 - 27 `

``

`6)`

` ( x - 4 ) ( x^2 + 4x + 16 ) `

`= ( x - 4 ) ( x^2 - x * 4 + 4^2 ) `

`= x^3 - 64`