计算:2/x+1 - 2/x-1
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计算:2/x+1 - 2/x-1
计算:2/x+1 - 2/x-1
计算:2/x+1 - 2/x-1
2/(x+1)-2/(x-1)
=[2(x-1)-2(x+1)]/(x²-1)
=-4/(x²-1)
=4/(1-x²)
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