12x-3y=?如题
问题描述:
12x-3y=?如题
1 12x-3y=?2 2x+y)-(x+2y)=?
答
1)12x-3y =3(4x-y) =3(2x+y)(2x-y) 2) ( 2x+y)-(x+2y) =(2x+y+x+2y)(2x+y-x-2y) =(3x+3y)(x-y) =3(x+y)(x-y)