问题描述：
Using the first two houses as an example,can you work out which number is missing from the third
house?
3 9 6
4 7 8 2 3 4
2 4 4 3 6 8 7 5
house?
3 9 6
4 7 8 2 3 4
2 4 4 3 6 8 7 5
问题解答：
我来补答展开全文阅读