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The problem of improving primary school mathematics ability solves an Olympic math problem in which fourth and fifth grade students apply Book III.
You should see that every staggered row has a difference of 8, and the number between 1357 rows has a difference of 8, which is arranged in the positive direction; The number between 2468 lines is reversed by 8.

The number 7 in the second column is 25, so the number 15 in the second column is 25+( 15-7)/2*8=57, so the number 15 in the third column is 57+1= 58; The number 9 in the second column is 25+(9-7)/2*8=33, so the number 9 in the fifth column is 33+3=36.