计算(x²/x-1)-x-1,
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计算(x²/x-1)-x-1,
计算(x²/x-1)-x-1,
计算(x²/x-1)-x-1,
(x²/x-1)-x-1
=(x²/x-1)-(x+1)
=(x²/x-1)-(x+1)(x-1)/(x-1)
=(x²/x-1)-(x^2-1)/(x-1)
=(x^2-x^2+1)/(x-1)
=1/(x-1)