21 25 19 21 17 17 15 13 13 ( ) ( )找规律填空,请问有什么规律
人气:290 ℃ 时间:2019-08-17 15:53:23
解答
添 9 11
规律是
奇数位差为2 21 19 17 15 13
偶数为差为4 25 21 17 13
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