(x^2+y^2)-x^2y^2=?
问题描述:
(x^2+y^2)-x^2y^2=?
答
(x²+y²)-x²y²
=x²+y²+2x²y²-3x²y²
=(x+y)²-3x²y²
=(x+y+√3xy)(x+y-√3xy)