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)
计算:1/(x-y)+1/(2y-2x)
原式=2/(2x-2y)-1/(2x-2y)
=1/(2x-2y)
1/(x-y)+1/(2y-2x)
=2/2(x-y)-1/2(x-y)
=1/ 2(x-y)
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