Đáp án:
`a,3x^2-6xy+3y^2`
`=3(x²-2xy+y²)`
`=3(x+y)²`
`b,12x^5+24x^4y^2+12x^3y^3`
Bổ sung đề :
`b) 12x^5y + 24 x^4y^2 + 12x^3y^3`
`=12x³y(x²+2xy+y²)`
`=12x³y(x+y)²`
`c,x^3+x^2y-x^2z-xyz`
`=x²(x+y)-xz(x+y)`
`=x(x+y)(x-z)`
`d,12x^5y + 24 x^4y^2 + 12x^3y^3`
`= 12x^3y.(x^2 + 2xy + y^2)`
`= 12x^3y.(x + y)^2`
@Star