> 数学 >
若n为正整数,则
(1-a)n
(a-1)n+1
的值为 ___ .
人气:474 ℃ 时间:2020-06-06 14:37:41
解答
当n为偶数时,
(1-a)n
(a-1)n+1
=
[-(a-1)]n
(a-1)n+1
=(a-1)-1
=
1
a-1

当n为奇数时,
(1-a)n
(a-1)n+1
=
[-(a-1)]n
(a-1)n+1
=-(a-1)-1
=-
1
a-1
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