>
数学
>
化简:
(
1
a
−1)÷
a
2
−1
a
2
+a
=______.
人气:491 ℃ 时间:2020-03-27 18:57:40
解答
原式=-
a−1
a
•
a(a+1)
(a+1)(a−1)
=-1.
故答案为:-1.
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