因式分解x^2y^2+y^2-x^2-1
问题描述:
因式分解x^2y^2+y^2-x^2-1
答
原式=y^2(x^2+1)-(x^2+1)=(x^2+1)(y^2+1)=(x^2+1)(y+1)(y-1)
答
x^2y^2+y^2-x^2-1
=x^2(y^2-1)+(y^2-1)
=(x^2+1)(y^2-1)
=(x^2+1)(y-1)(y+1)