同步课时特训数学七上1.1 12题把数字如图排列中间一排:1、5、13、25····则中间第十个数是几?12 36 5 4 7 8 9 1015 14 13 12 1116 17 18 19 20 2128 27 26 25 24 23 22·······························
问题描述:
同步课时特训数学七上1.1 12题
把数字如图排列中间一排:1、5、13、25····则中间第十个数是几?
1
2 3
6 5 4
7 8 9 10
15 14 13 12 11
16 17 18 19 20 21
28 27 26 25 24 23 22
···············
················
答
37