1 . 我国古代的《洛书》中记载着世界上最古老的一个幻方:如图,将
填入
的方格内,使三行,三列和两条对角线上的三个数字之和都等于
.一般地,将连续的正整数
填入
个方格中,使得每行,每列和两条对角线上的数字之和都相等,这个正方形叫做
阶幻方记
阶幻方的对角线上的数字之和为
,如图三阶幻方的
,那么
的值为( )
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