化简[X2-(1/x)]/[x+1+(1/x)]
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化简[X2-(1/x)]/[x+1+(1/x)]化简[X2-(1/x)]/[x+1+(1/x)]化简[X2-(1/x)]/[x+1+(1/x)][X²-(1/x)]/[x+1+(1/x)]=
化简[X2-(1/x)]/[x+1+(1/x)]
化简[X2-(1/x)]/[x+1+(1/x)]
化简[X2-(1/x)]/[x+1+(1/x)]
[X²-(1/x)]/[x+1+(1/x)]
=[(x³-1)/x]/[(x²+x+1)/x]
=(x³-1)/(x²+x+1)
=(x-1)(x²+x+1)/(x²+x+1)
=x-1
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