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: 2/3
    Solution:
    2/3 = 0 ··· ··· 2
    Column vertical calculation:

		0
3	丿	2
		0
		2

[2/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 5/80
    Solution:
    5/80 = 0 ··· ··· 5
    Column vertical calculation:

			0
8	0	丿	5
			0
			5

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 3/21
    Solution:
    3/21 = 0 ··· ··· 3
    Column vertical calculation:

			0
2	1	丿	3
			0
			3

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