x²-y²/xy - xy-y²/x(y-x)
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x²-y²/xy - xy-y²/x(y-x)
![x²-y²/xy - xy-y²/x(y-x)](/uploads/image/z/16296158-38-8.jpg?t=x%26%23178%3B-y%26%23178%3B%2Fxy+-+xy-y%26%23178%3B%2Fx%28y-x%29)
=(x²-y²)/xy-y(x-y)/x(y-x)
=(x²-y²)/xy+y(x-y)/x(y-x)
=(x²-y²)/xy+y/x
=(x²-y²+y²)/xy
=x/y
再问: =(x²-y²)/xy-y(x-y)/x(y-x) =(x²-y²)/xy+y(x-y)/x(y-x) 别的都没变 -为什么变成+
再答: =(x²-y²)/xy-y(x-y)/x(y-x) =(x²-y²)/xy+y(x-y)/x(x-y) 最后一个y-x应变成x-y
=(x²-y²)/xy+y(x-y)/x(y-x)
=(x²-y²)/xy+y/x
=(x²-y²+y²)/xy
=x/y
再问: =(x²-y²)/xy-y(x-y)/x(y-x) =(x²-y²)/xy+y(x-y)/x(y-x) 别的都没变 -为什么变成+
再答: =(x²-y²)/xy-y(x-y)/x(y-x) =(x²-y²)/xy+y(x-y)/x(x-y) 最后一个y-x应变成x-y