计算:1/(x-y)+1/(2y-2x)
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计算:1/(x-y)+1/(2y-2x)
![计算:1/(x-y)+1/(2y-2x)](/uploads/image/z/19130538-66-8.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A1%2F%28x-y%29%2B1%2F%282y-2x%29)
原式=2/(2x-2y)-1/(2x-2y)
=1/(2x-2y)
=1/(2x-2y)
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