如何计算：a^2/a-1-a-1

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如何计算：a^2/a-1-a-1
如何计算：a^2/a-1-a-1

如何计算：a^2/a-1-a-1
a^2/(a-1)-(a+1)
=a^2/(a-1)-(a^2-1)/(a-1)
=[a^2-(a^2-1)]/(a-1)
=(a^2-a^2+1)/(a-1)
=1/(a-1).