2/(x-1) ÷(2/(x^2-1) + 1/(x+1))
=2/(x-1)÷(2/(x+1)(x-1)+ 1/(x+1))
=2/(x-1)÷(2+x-1)/(x+1)(x-1)
=2/(x-1)÷(x+1)/(x+1)(x-1)
=2/(x-1)÷1/(x-1)
=2
化简分式2/x-1 ÷(2/x^2-1 + 1/x+1)的结果是
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