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Arrange the natural numbers from 1 to 100 as shown in the following table. In this table, the long side has three numbers and the wide side has two numbers Arrange the natural numbers from 1 to 100 as shown in the table. In this table, surround the three numbers on the long side and the two numbers on the wide side with a rectangular box. The sum of the six numbers is 87. In other parts of the table, the sum of the six numbers enclosed as mentioned above is 429? 1 2 3 4 5 6 7 8 9 （10 11 12 ） 13 14 15 16 （17 18 19 ） 20 21 ......................................... .................................. .............................................97 98 99 100
If the number in the middle of the lower row is x, then the sum of the three numbers in the lower row is 3x, and the upper row is 3x-21 (each number has a difference of 7, and three numbers are 21), then 6x-21 = 429, x = 75, So the biggest number x is 75 + 1 = 76, so the answer is 76, not 77. If you want to understand mathematics, you can ask me directly. I'm a high school mathematics teacher who just graduated from university
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