化简求值，(3x/x-1-x/x+1)/x/x2-1,其中x=根号2-2
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[3x/(x-1) - x/(x+1)]÷ x/(x²-1)
=[3x/(x-1) - x/(x+1)] * (x²-1)/x
=[3x/(x-1)]* (x²-1)/x - [x/(x+1)] * (x²-1)/x
=3(x+1) -(x-1)
=3x+3-x+1
=2x+4
=2(根号2-2）+4
=2根号2 - 4+4
=2根号2
=[3x/(x-1) - x/(x+1)] * (x²-1)/x
=[3x/(x-1)]* (x²-1)/x - [x/(x+1)] * (x²-1)/x
=3(x+1) -(x-1)
=3x+3-x+1
=2x+4
=2(根号2-2）+4
=2根号2 - 4+4
=2根号2
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