Question

(初二上)提公因式法分解因式：1.(x+y)^2-3(x+y) 2.3x（x-y)+2x（y-x）-y（x-y） 3.m

Answer 1

1、(x+y)(x+y-3)

2、(x-y)(3x-2x-y)=(x-y)(x-y)=(x-y)²

3、m(m-n)²[m^(n-1)-2n]