计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1.

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计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1.
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计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1.
计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1.

计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1.
计算:(1+1/x)·x²-2x+1/x²-1;
=(x+1)/x×(x-1)²/(x²-1)
=(x-1)/x;
(x²/x-1-2x/1-x)÷x/x-1.
=(x²+2x)/(x-1)×(x-1)/x;
=x+2;
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