1. 1 19 Jiugongge Sudoku formula Jiugongge calculation formula: two or four shoulders, six or eight is enough.

Up nine, next, left seven, right three

For example: 15,-12, -9, -6, -3, 0, 3, 6, 9.

Because the differences between these numbers are the same, they can be numbered as-15,-12, -9, -6, -3, 0, 3, 6, 9, which can be ①, ②, ③, ④, ⑧, ⑨ respectively.

This has become a simple nine-square grid that we usually use. According to the formula: 2,4 is the shoulder, 6,8 is the foot, and 5 is the middle, we can deduce that:

②⑨④

⑦⑤③

⑥①⑧

Then turn the serial number into the original number and get the answer.

- 12、3、0

9 、-3、- 15

-6、-9、6