(x+3y-2)(x-3y+2)=_______
问题描述:
(x+3y-2)(x-3y+2)=_______
答
(x+3y-2)(x-3y+2)=[x+(3y-2)][x-(3y-2)]=x^2-(3y-2)^2
(x+3y-2)(x-3y+2)=_______
(x+3y-2)(x-3y+2)=[x+(3y-2)][x-(3y-2)]=x^2-(3y-2)^2