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)