MTC RMO Junior Round 2 真题答案分享

文摘   教育   2024-04-22 19:42   新加坡  

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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