140, answer is 29

來源: 實現四化 於 2010-07-16 12:53:07 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (116 bytes)

140 21, 23, ?, 47, 75, 110

21 + 2X1 = 23
23 + 2X3 = 29
29 + 2X9 = 47
47 + 4X7 = 75
75 + 7X5 = 110

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