Đáp án`+`Giải thích các bước giải:
` a) 8x^3 -64 = (2x)^3 - 4^3 `
`= (2x-4)(4x^2 + 8x + 16)`
` b) 1 + 8x^6 y^3 = 1^3 + (2x^2y)^3 `
`= (1+2x^2 y)(1 - 2x^2 y + 4x^4 y^2 ) `
` c) 125x^3 +1 = (5x)^3 + 1^3`
`= (5x+1)(25x^2 - 5x + 1)`
` q) 8x^3 - 27 = (2x)^3- 3^3`
`= (2x -3)(4x^2 + 6x + 9) `
` r) 27x^3 + y^3/8 `
`= (3x)^3 + (y/2)^3 `
`= (3x+y/2)(9x^2 - (3y)/2 + y^2/4) `
` s) 125x^3 + 27y^3`
`= (5x)^3 + (3y)^3`
`= (5x+3y)(25x^2 - 15xy + 9y^2) `
