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How to fill in the nine squares of the number 1-9?
***9 numbers between 1 and 9 add up to 45, 1+2+3+4+5+6+7+8+9=45.

Jiugongge means that every three different numbers add up to the same number, that is, 45/3= 15.

The head and tail add up to the same number, that is, 1+9=2+8=3+7=4+6, and 5 is single, and 5 can only be placed in the middle, so it can be arranged like this:

6 1 8

7 5 3

2 9 4