Law of number matrix graph There are nine numbers: 0, 3, 3, 6, 6, 9, 9, 12, 15. Put them into three columns and three rows, so that the numbers in the nine squares, the addition of three horizontal, vertical and oblique, are equal to the same number!

Law of number matrix graph There are nine numbers: 0, 3, 3, 6, 6, 9, 9, 12, 15. Put them into three columns and three rows, so that the numbers in the nine squares, the addition of three horizontal, vertical and oblique, are equal to the same number!

Since the sum of each row is equal, then the sum of each row is equal to one-third of the sum of nine numbers, (0 + 3 + 3 +... + 12 + 15) / 3 = 21. The sum of three groups of horizontal and vertical slants at four fixed points of the matrix is 21, the sum of four groups of horizontal and vertical slants at the center of the matrix is 21, and the sum of two groups of horizontal and vertical slants at the other four points is 21, 3 is the only combination of two groups of 15 whose sum is 21, so 15 is at the point of the third case, and 0,12,9 is another unique group of 0 whose sum is 21, so 0 is also at the point of the third case and is in the same row or column with 15, and 12,9 is in the same row or column with 0. In this way, the matrix has fixed seven numbers. The remaining two numbers are obvious
The answer is
First line 3,6,12
Second line 15,6,0
Third line 3,9,9