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15,21,18,19,21,17,24,15.这组数字的规律
15,21,18,19,21,17,24,15.帮忙看看这组数字的规律,
人气:391 ℃ 时间:2019-08-31 15:00:10
解答
15+3=18
18+3=21
21+3=24
24+3=27
21-2=19
19-2=17
17-2=15
15-2=13
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