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

[1/7 Formula]
    Work: Calculate the value of equation 70-21-20 .
    Question type: Mathematical calculation
    Solution:
          70-21-20
        =49-20
        =29
    Answer:70-21-20=29
[2/7 Formula]
    Work: Calculate the value of equation 94-24-18 .
    Question type: Mathematical calculation
    Solution:
          94-24-18
        =70-18
        =52
    Answer:94-24-18=52
[3/7 Formula]
    Work: Calculate the value of equation 89-24-15 .
    Question type: Mathematical calculation
    Solution:
          89-24-15
        =65-15
        =50
    Answer:89-24-15=50
[4/7 Formula]
    Work: Calculate the value of equation 90-22-8 .
    Question type: Mathematical calculation
    Solution:
          90-22-8
        =68-8
        =60
    Answer:90-22-8=60
[5/7 Formula]
    Work: Calculate the value of equation 95-10-15 .
    Question type: Mathematical calculation
    Solution:
          95-10-15
        =85-15
        =70
    Answer:95-10-15=70
[6/7 Formula]
    Work: Calculate the value of equation 88-50-23 .
    Question type: Mathematical calculation
    Solution:
          88-50-23
        =38-23
        =15
    Answer:88-50-23=15
[7/7 Formula]
    Work: Calculate the value of equation 81-31-24 .
    Question type: Mathematical calculation
    Solution:
          81-31-24
        =50-24
        =26
    Answer:81-31-24=26

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>>注：本次最多计算 7 道题。

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