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,

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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,15,21,18,19,21,17,24,15.这组数字的规律15

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,
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,

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,
15+3=18
18+3=21
21+3=24
24+3=27
21-2=19
19-2=17
17-2=15
15-2=13

个两个差三
18-15=3
21-19=2
反过来是2

15+3=18
18+3=21
21+3=24
24+3=27
21-2=19
19-2=17
17-2=15
15-2=13