化简求值x^2-2xy+y^2分之x^2-y^2 其中x=100,y=10
问题描述：
化简求值x^2-2xy+y^2分之x^2-y^2 其中x=100,y=10
答
(x^2-y^2)/(x^2-2xy+y^2)
=(x+y)(x-y) / (x-y)²
=(x+y)/(x-y)
=(100+10)/(100-10)
=110/90
=11/9