Đáp án+Giải thích các bước giải:
`c)A=x^3+6x^2+12x+8`
`A=x^3+3.x^{2}.2+3.x.2^2+2^3`
`A=(x+2)^3`
`c)A=-x^3+9x^2-27x+27`
`A=(-x)^3+3.(-x)^{2}.3+3.(-x).3^2+3^3`
`A=(-x+3)^3`
`c)A=1-8x^3`
`A=1-(2x)^3`
`A=(1-2x)[1+2x+(2x)^2]`
`A=(1-2x)(4x^2+2x+1)`
`c)A=x^3+27`
`A=x^3+3^3`
`A=(x+3)(x^2-3x+9)`
`c)A=8x^3-y^3`
`A=(2x)^3-y^3`
`A=(2x-y)[(2x)^2+2xy+y^2]`
`A=(2x-y)(4x^2+2xy+y^2)`
`c)A=8x^3-1/8`
`A=(2x)^3-(1/2)^3`
`A=(2x-1/2)[(2x)^2+2x*1/2+(1/2)^2]`
`A=(2x-1)(4x^2+x+1/4)`
`c)A=x^3+1/27`
`A=x^3+(1/3)^3`
`A=(x+1/3)[x^2-x*1/3+(1/3)^2]`
`A=(x+1/3)(x^2-1/3x+1/9)`
`c)A=125x^3-1/125`
`A=(5x)^3-(1/5)^3`
`A=(5x-1/5)[(5x)^2+5x*1/5+(1/5)^2]`
`A=(5x-1/5)(25x^2+x+1/25)`
