4.15 数学 找到一个原题

skybruin

脑残中，只记得三个数学题了。
1，x,y都是整数，x+y+1能否被n整除？
1）x能被n整除
2）不记得了，不过选E
2，是一道说医生年龄的题目，OG上的好像，我记得做过，就是说提早十年工作是年龄的1/3？退后十年是2/3的那个？大概是这样的。
How many years did Dr. J live?
1. If Dr. J had become a doctor 10 years earlier than he did, he would have been a doctor for exactly 2/3 of his life.
2. If Dr. J had become a doctor 10 years later than he did, he would have been a doctor for exactly 1/3 of his life.
3，两个大数的1/3是两个比较小的数的5背，问小数是否小于4？
 1）大数大于55
 2）大数小于65    我的理解是两个大数的和的1/3是两个比较小数的和的5倍，不知道对不对。 数学47

jiayini85

3只狗也算是狗 感谢遛狗的LZ ！

jiayini85

弱弱的问一下 LZ 你OG 是哪个版本的？11？12？我去看看答案~~我DS超弱的

skybruin

忘记了，不是OG上的，是蓝皮书上的数学。