Câu hỏi của Hoài An

Question

1) 3xy3 + 6x3y + xy

2) 4x3 + 8x2 + 4x

3) 4x2 - 4x + 1 - y2

Nguyễn Việt Lâm · Accepted Answer

$3xy^3+6x^3y+xy=xy\left(3y^2+6x^2+1\right)$

$4x^3+8x^2+4x=4x\left(x^2+2x+1\right)=4x\left(x+1\right)^2$

$4x^2-4x+1-y^2=\left(2x-1\right)^2-y^2=\left(2x-1-y\right)\left(2x-1+y\right)$Câu trả lời: $3xy^3+6x^3y+xy=xy\left(3y^2+6x^2+1\right)$

$4x^3+8x^2+4x=4x\left(x^2+2x+1\right)=4x\left(x+1\right)^2$

$4x^2-4x+1-y^2=\left(2x-1\right)^2-y^2=\left(2x-1-y\right)\left(2x-1+y\right)$