所谓“设而不求”的未知数,又叫辅助元,它们是我们为解决实际问题而增设的一些参数,能起到沟通数量关系,架起已知量和未知量之间的桥梁的作用.例1在图1中,要求在方格内填入不同的数,使每行、每列、每条对角线上的三个数之和相等.请你求出右下角的问号处应填什么 The so-called “set and not ” unknowns, also known as auxiliary elements, they are some of the additional parameters we have to solve practical problems, can play a relationship between the number of communication, set up a bridge between the known amount and the unknown Example 1 In Figure 1, it is required to fill different numbers in the grid so that the sum of the three numbers in each row, column, and diagonal is the same. Find the question mark in the lower right corner What should be filled