化简x²/y-x+y²/x-y的结果是
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化简x²/y-x+y²/x-y的结果是
![化简x²/y-x+y²/x-y的结果是](/uploads/image/z/20107290-66-0.jpg?t=%E5%8C%96%E7%AE%80x%26%23178%3B%2Fy-x%2By%26%23178%3B%2Fx-y%E7%9A%84%E7%BB%93%E6%9E%9C%E6%98%AF)
x²/y-x+y²/x-y
=-x²/x-y+y²/x-y
=-(x²-y²)/(x-y)
=-(x+y)(x-y)/(x-y)
=-x-y
=-x²/x-y+y²/x-y
=-(x²-y²)/(x-y)
=-(x+y)(x-y)/(x-y)
=-x-y
化简:(2x-y)²-4(x-y)(x+y)
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