因式分解(x2+1)y2-x2-1
问题描述:
因式分解(x2+1)y2-x2-1
答
(x2+1)y2-x2-1
=x2y2+y2-x2-1
=(x2y2-x2)+(y2-1)
=x2(y2-1)+(y2-1)
=(x2-1)(y2-1)
=(x+1)(x-1)(y+1)(y-1)