3个回答
展开全部
解:2/(x^2-1)-1/(x-1)
=2/[(x-1)(x+1)]-1/(x-1)
=1/(x-1) -1/(x+1) -1/(x-1)
=1/(x-1) -1/(x-1) -1/(x+1)
=-1/(x+1)
=2/[(x-1)(x+1)]-1/(x-1)
=1/(x-1) -1/(x+1) -1/(x-1)
=1/(x-1) -1/(x-1) -1/(x+1)
=-1/(x+1)
追答
所以题目的答案是-1/(x+1).
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展开全部
2/(x²-1)-1/(x-1)
=2/[(x+1)(x-1)] - 1/(x-1)
=[2-(x+1)]/[(x+1)(x-1)]
=-(x-1)/[(x+1)(x-1)]
=-1/(x+1)
=2/[(x+1)(x-1)] - 1/(x-1)
=[2-(x+1)]/[(x+1)(x-1)]
=-(x-1)/[(x+1)(x-1)]
=-1/(x+1)
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