化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)

问题描述:

化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)

(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)
=(x+y)(x-y)/(x+y)+(x-y)^2/(x-y)
=x-y+x-y
=2(x-y)