x^2y^2-0.01

问题描述:

x^2y^2-0.01
2x^2+2x+1/2

x^2y^2-0.01
=(xy+0.1)(xy-0.1)
2x^2+2x+1/2
=2(x^2+x+1/4)
=2(x+1/2)^2