question 2: greatest number is 5?

because for any arithmetic sequence of positive nunbers, the sum of the first ten terms must be a multiple of 55, and the greatest integer that devides 55 is 5.

所有跟帖： 

• 回复：question 2: greatest number is 5? -爱苹果- ♀ (117 bytes) () 12/06/2008 postreply 18:19:39

• read the problem again, it is 55 that devides all the sums -布衣之才- ♂ (338 bytes) () 12/06/2008 postreply 18:29:39

• 写得什么呀，自己都看不懂了 -布衣之才- ♂ (339 bytes) () 12/06/2008 postreply 18:34:13

• 回复：read the problem again, it is 55 that devides all the sums -爱苹果- ♀ (48 bytes) () 12/06/2008 postreply 18:34:18

• 等差数列 又叫 算术数列；等比数列 又叫 几何数列 -布衣之才- ♂ (66 bytes) () 12/06/2008 postreply 18:40:04

• 回复：read the problem again, it is 55 that devides all the sums -爱苹果- ♀ (138 bytes) () 12/06/2008 postreply 19:02:17

• 你比我严格 -布衣之才- ♂ (196 bytes) () 12/06/2008 postreply 19:21:44

• 又错了，脑袋糊涂了 -布衣之才- ♂ (66 bytes) () 12/06/2008 postreply 19:25:39