[x^2-y^2)除以(x+y)]^2除以（x-y)
问题描述：
[x^2-y^2)除以(x+y)]^2除以（x-y)
计算题,符号用汉字说明,“^”是平方,跟在后面的是次数
答
(x^2-y^2)/(x+y)^2/(x-y)
=(x+y)(x-y)/(x+y)^2/(x-y)
=1/(x+y)