prep ds196

cindytim

How many odd integers are greater than the integer x and less than the integer y ?



(1)There are 12 even integers greater than x and less than y.



(2)There are 24 integers greater than x and less than y.

--------------------------------------------------------------------------------------------------------------------------------------------------------【答案】B

【思路】

(1) 不知道有幾個數是介於x,y. 有可能奇數比偶數多1或少1

(2) 有一半是奇數

题目没有说是连续的， 怎么 得出一半奇数，一般偶数

切尔西

比较两个数间的数，比一个大，比另外一个小，没有办法做到不连续的哈，就好比比10大，比20小的数，不可能把5或者22插进去撒