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1、你能将自然数1—9排列在下面6个正方形的四角,使每个正方形四角的4个数之和等于20吗? 2、你能把自然数1—13排列在下面11个正方形的四角,使每个正方形四角的4个数之和等于28吗? 据美国 Teaching K—8 1992年第11、12期。
1. Can you arrange natural numbers 1-9 in the four corners of the following six squares so that the sum of the four numbers in each corner of each square is equal to 20? 2. You can arrange natural numbers 1-13 in the four corners of the following 11 squares. Is the sum of the 4 numbers of the squares of each square equal to 28? According to the United States Teaching K-8, Nos. 11 and 12 of 1992.