Overview: 3 questions will be solved this time.Among them
           ☆3 integer calculations

[1/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 726/57
    Solution:
    726/57 = 12 ··· ··· 42
    Column vertical calculation:

				1	2
5	7	丿	7	2	6
			5	7
			1	5	6
			1	1	4
				4	2

[2/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 685/23
    Solution:
    685/23 = 29 ··· ··· 18
    Column vertical calculation:

				2	9
2	3	丿	6	8	5
			4	6
			2	2	5
			2	0	7
				1	8

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 280/50
    Solution:
    280/50 = 5 ··· ··· 30
    Column vertical calculation:

					5
5	0	丿	2	8	0
			2	5	0
				3	0

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