1/(x-y)与1/(y-x)通分

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1/(x-y)与1/(y-x)通分
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1/(x-y)与1/(y-x)通分
1/(x-y)与1/(y-x)通分

1/(x-y)与1/(y-x)通分
1/（x-y）
1/（y-x）=-1/(x-y)
将负号提出去

1/x-y
-1/x-y

一般有如下两种情况：
1/(x-y)+1/(y-x)
= 1/(x-y) - 1/(x-y)
= 0
1/(x-y) - 1/(y-x)
= 1/(x-y) + 1/(x-y)
= 2 / (x-y)