x^2+2xy+y^2/x^2-y^2约分
问题描述:
x^2+2xy+y^2/x^2-y^2约分
答
(x^2+2xy+y^2)/(x^2-y^2)
=(x+y)^2/[(x-y)(x+y)]
=(x+y)/(x-y)