(1+1/x)÷(2x-(1+x²)/x)

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(1+1/x)÷(2x-(1+x²)/x)
(1+1/x)÷(2x-(1+x²)/x)

(1+1/x)÷(2x-(1+x²)/x)
上下各进行通分,最后得1/(x-1)