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2x/(x²-4)-1/(x-2)
人气：445 ℃　时间：2020-02-05 08:19:58
解答
原式=2x/(x+2)(x-2)-(x+2)/(x+2)(x-2)
=[2x-(x+2)]/(x+2)(x-2)
=(x-2)/(x+2)(x-2)
=1/(x+2)
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