(x^2-xy+0.25x^2)/4x^2-y^2
问题描述:
(x^2-xy+0.25x^2)/4x^2-y^2
答
(x^2-xy+0.25x^2)/4x^2-y^2
=(1-y/x+0.25)/4-y^2
=0.3125-0.25y/x-y^2