把21,22,23,24,25,26,27,28,29这九个数填入空格里,使每条直线上三个数的和都等于75,这种题目是否有公式?
人气：254 ℃ 时间：2019-10-19 23:57:15
解答
【答案】
28 21 26
23 25 27
24 29 22
【解析】最中间数放在九方格中心,四个偶数排在四角.排列组合即可.
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