(x^2-xy+0.25x^2)/4x^2-y^2

问题描述:

(x^2-xy+0.25x^2)/4x^2-y^2

(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