1/【2x+(1-x^2)/x]

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1/【2x+(1-x^2)/x]
1/【2x+(1-x^2)/x]

1/【2x+(1-x^2)/x]
原式=(1/(2x^2/x + 1-x^2/x))
=1/((1+x^2)/X)
=x/(1+x^2)

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