✔ 最佳答案
2個 - 52,53
3個 - 34,35,36
5個 - 19,20,21,22,23
6個 - 15,16,17,18,19,20
7個 - 12,13,14,15,16,17,18
10個 - 6,7,8,9,10,11,12,13,14,15
2012-07-23 22:49:16 補充:
同14個 - 1,2,3,4,5,6,7,8,9,10,11,12,13,14
2012-07-24 10:47:05 補充:
設有 n個 (n>1) 正整數, 首項為 a (a>0), 則末項是 (a+n-1).
公式:和 = (首項 + 末項) * 項數 / 2, 所以
105 = (a + a+n-1) * n/2
210 = n * (2a + n - 1) = 2*105 = 3*70 = 5*42 = 6*35 = 7*30 = 10*21 = 14*15
所以, n 的可能值是 2, 3, 5, 6, 7, 10, 14.