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

[1/7 Formula]
    Work: Calculate the value of equation 214-(86+14) .
    Question type: Mathematical calculation
    Solution:
          214-(86+14)
        =214-100
        =114
    Answer:214-(86+14)=114
[2/7 Formula]
    Work: Calculate the value of equation 690-177+77 .
    Question type: Mathematical calculation
    Solution:
          690-177+77
        =513+77
        =590
    Answer:690-177+77=590
[3/7 Formula]
    Work: Calculate the value of equation 787-(87-29) .
    Question type: Mathematical calculation
    Solution:
          787-(87-29)
        =787-58
        =729
    Answer:787-(87-29)=729
[4/7 Formula]
    Work: Calculate the value of equation 755-287+87 .
    Question type: Mathematical calculation
    Solution:
          755-287+87
        =468+87
        =555
    Answer:755-287+87=555
[5/7 Formula]
    Work: Calculate the value of equation 365-(65+118) .
    Question type: Mathematical calculation
    Solution:
          365-(65+118)
        =365-183
        =182
    Answer:365-(65+118)=182
[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 871-299
    Solution:
    871-299 = 572
    Column vertical calculation:

			1	1
			8	7	1
➖			2	9	9
			5	7	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 157-99
    Solution:
    157-99 = 58
    Column vertical calculation:

			1	1
			1	5	7
➖				9	9
			0	5	8

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>>注：本次最多计算 7 道题。

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