MTC RMO Junior 第二轮真题答案分享
RMO 2024
2024 RMO Junior 真题解答分享来啦!
给大家科普一下Junior 和 Open的分别:小四和小五同学考的是 Junior卷子,小六考生们面对的是Open卷子。
Junior Rd 2 和Open Rd 2 卷子前七道题是一样的。差别就在后面的题目;Junior Rd 2 后面是8道题 (总共7+8=15题), Open Rd 2后面是4道题 (总共7+4=11题)。
Open Rd 2的最后四道是需要写出解答的。
今年 RMO Rd 2 Junior 题目难度可以用五个字来评语:难度相当大!
大家可以参考一下MTC的答案。感谢同学和家长们提供的题目,我们等着大家的好消息!
第一题
Question 1
解答:
答案:2024
第二题
Question 2
解答:
答案:12162
第三题
Question 3
解答:
Note that the last two scenarios have the same speed of a+b+12
Difference between the original time and the new time gives the 25km difference in first two scenarios.
答案:30km/h
第四题
Question 4
解答:
答案:1352
第五题
Question 5
解答:
答案:120
第六题
Question 6
解答:
答案:540/11
第七题
Question 7
解答:
答案:81
第八题
Question 8
解答:
答案:3309
第九题
Question 9
解答:
As for why 7 or less is not possible, we can consider the following.
Look at the Type A and Type B given. Since we have 12 black, we need at least 5 of type A and at most 2 of type B. The problem is that at least 5 of type A will 'turn on' 5 white squares but the at most 2 of type B will 'turn off' at most 4 white squares. So in the end there is at least some white square still turned on, contradiction.
答案:8
第十题
Question 10
解答:
答案:15180
第十一题
Question 11
解答:
答案:8550
第十二题
Question 12
解答:
答案:6072
第十三题
Question 13
解答:
答案:68cm
第十四题
Question 14
解答:
答案:9901
第十五题
Question 15
解答:
答案:198
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