y/x²-xy+x/y²-xy 分式的加减,
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y/x²-xy+x/y²-xy 分式的加减,
![y/x²-xy+x/y²-xy 分式的加减,](/uploads/image/z/19407456-0-6.jpg?t=y%2Fx%26sup2%3B-xy%2Bx%2Fy%26sup2%3B-xy+%E5%88%86%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%2C)
=y/x(x-y)-x/y(x-y)
=(y²-x²)/xy(x-y)
=-(x+y)(x-y)/xy(x-y)
=-(x+y)/xy
=(y²-x²)/xy(x-y)
=-(x+y)(x-y)/xy(x-y)
=-(x+y)/xy
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