>
数学
>
先化简,再求值:
a
2
−1
a
2
−2a+1
÷
a+1
a
3
−
a
2
,其中
a=
3
.
人气:257 ℃ 时间:2020-03-21 01:24:46
解答
原式=
(a+1)(a−1)
(a−1)
2
•
a
2
(a−1)
a+1
=a
2
;
当a=
3
时,原式=3.
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