质量效应2 好玩的职业:因式分解

来源:百度文库 编辑:查人人中国名人网 时间:2024/05/06 01:57:11
(1-x^2)(1-y^2)-4xy

=(1-x)(1+x)(1-y)(1+y)-4xy
=(1-x-y+xy)(1+x+y+xy)-4xy
=1+(xy)*2+2xy-x*2-y*2+2xy
=(1-xy)*2-(x-y)*2
=(1-xy-x+y)(1-xy+x-y)