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: 662-523
    Solution:
    662-523 = 139
    Column vertical calculation:

				1
			6	6	2
➖			5	2	3
			1	3	9

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 688-428
    Solution:
    688-428 = 260
    Column vertical calculation:

			6	8	8
➖			4	2	8
			2	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 774-273
    Solution:
    774-273 = 501
    Column vertical calculation:

			7	7	4
➖			2	7	3
			5	0	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1492-185
    Solution:
    1492-185 = 1307
    Column vertical calculation:

					1
			1	4	9	2
➖				1	8	5
			1	3	0	7

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 939-497
    Solution:
    939-497 = 442
    Column vertical calculation:

			1
			9	3	9
➖			4	9	7
			4	4	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-448
    Solution:
    540-448 = 92
    Column vertical calculation:

			1	1
			5	4	0
➖			4	4	8
			0	9	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 683-604
    Solution:
    683-604 = 79
    Column vertical calculation:

				1
			6	8	3
➖			6	0	4
			0	7	9

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>>注：本次最多计算 7 道题。

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