化简(2/x+1 -1/x-1)(x²-1)
3个回答
原式=[2/(x+1)-1/(x-1)](x+1)(x-1)
=2/(x+1)*(x+1)(x-1)-1/(x-1)*(x+1)(x-1)
=2(x-1)-(x+1)
=2x-2-x-1
=x-3
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