Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2007-809
    Solution:
    2007-809 = 1198
    Column vertical calculation:

			1	1	1
			2	0	0	7
➖				8	0	9
			1	1	9	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2004-702
    Solution:
    2004-702 = 1302
    Column vertical calculation:

			1
			2	0	0	4
➖				7	0	2
			1	3	0	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2002-634
    Solution:
    2002-634 = 1368
    Column vertical calculation:

			1	1	1
			2	0	0	2
➖				6	3	4
			1	3	6	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2001-533
    Solution:
    2001-533 = 1468
    Column vertical calculation:

			1	1	1
			2	0	0	1
➖				5	3	3
			1	4	6	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2005-426
    Solution:
    2005-426 = 1579
    Column vertical calculation:

			1	1	1
			2	0	0	5
➖				4	2	6
			1	5	7	9

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2006-324
    Solution:
    2006-324 = 1682
    Column vertical calculation:

			1	1
			2	0	0	6
➖				3	2	4
			1	6	8	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2008-236
    Solution:
    2008-236 = 1772
    Column vertical calculation:

			1	1
			2	0	0	8
➖				2	3	6
			1	7	7	2

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>>注：本次最多计算 7 道题。

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