40mm单兵火箭筒:分解因式

来源:百度文库 编辑:查人人中国名人网 时间:2024/05/13 16:19:03
x2y2-x2-y2-4xy+1

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