a3n−1 |
n |
一组按一定规律排列的式子:-a2,a52,-a83,a114,…,(a≠0),则第n个式子是_(n为正整数).
一组按一定规律排列的式子:-a2,
,-
,
,…,(a≠0),则第n个式子是______(n为正整数).
a5 |
2 |
a8 |
3 |
a11 |
4 |
数学人气:854 ℃时间:2019-10-25 03:54:55
优质解答
根据分子和分母的规律可知第n个式子为(-1)n
.
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