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(一)和迷阵: 把1、2、3、4、5、6、7、8、9九个数分别填在下面有九个空格的方阵内,使每行每列的三个数的和都相等,题目很简单,填法也不只一种,方阵①中每行每列三个数的和都是15,这一点是有趣的,象这样的方阵称它为和迷阵(或幻方)。那末怎样九个数,按怎样方式填入才能成为和迷阵呢?方法也很简单,只要任取等差数列中连续九项,如A_1,A_2,A_3,……A_9,根据足码按①的号码填入必为和迷阵。
(a) and puzzle: Fill nine numbers of 1, 2, 3, 4, 5, 6, 7, 8, and 9 in the square matrix with nine spaces below, so that each row has three numbers in each column. The sum is equal, the title is very simple, there is not only one way to fill in, and the sum of three numbers in each row and each row of the square matrix 1 is 15. This is interesting. (or magic square). Then how can the nine numbers be filled in to become and conquer? The method is also very simple, as long as you take any number of consecutive nine items in the arithmetic progression, such as A_1, A_2, A_3, ... A_9, and press 1 according to the foot code. The numbers must be filled in and confused.