计算分式x-y/x²+xy乘以x²y²-x的四次方/xy-x²
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计算分式x-y/x²+xy乘以x²y²-x的四次方/xy-x²
![计算分式x-y/x²+xy乘以x²y²-x的四次方/xy-x²](/uploads/image/z/16492440-48-0.jpg?t=%E8%AE%A1%E7%AE%97%E5%88%86%E5%BC%8Fx-y%2Fx%26%23178%3B%2Bxy%E4%B9%98%E4%BB%A5x%26%23178%3By%26%23178%3B-x%E7%9A%84%E5%9B%9B%E6%AC%A1%E6%96%B9%2Fxy-x%26%23178%3B)
原式=(x-y)/x(x+y)*[-x²(x²-y²)]/[-x(x-y)]
=(x-y)/x(x+y)*x²(x+y)(x-y)/x(x-y)
=(x-y)/x(x+y)*x(x+y)
=x-y
=(x-y)/x(x+y)*x²(x+y)(x-y)/x(x-y)
=(x-y)/x(x+y)*x(x+y)
=x-y
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