化简(a^2/a-1)-a-1的结果是
问题描述:
化简(a^2/a-1)-a-1的结果是
答
=a²/(a-1)-(a+1)
=a²/(a-1)-(a+1)(a-1)/(a-1)
=[a²-(a+1)(a-1)]/(a-1)
=(a²-a²+1)/(a-1)
=1/(a-1)