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

[1/7 Formula]
    Work: Calculate the value of equation 74-21-20 .
    Question type: Mathematical calculation
    Solution:
          74-21-20
        =53-20
        =33
    Answer:74-21-20=33
[2/7 Formula]
    Work: Calculate the value of equation 99-24-18 .
    Question type: Mathematical calculation
    Solution:
          99-24-18
        =75-18
        =57
    Answer:99-24-18=57
[3/7 Formula]
    Work: Calculate the value of equation 93-24-15 .
    Question type: Mathematical calculation
    Solution:
          93-24-15
        =69-15
        =54
    Answer:93-24-15=54
[4/7 Formula]
    Work: Calculate the value of equation 94-22-8 .
    Question type: Mathematical calculation
    Solution:
          94-22-8
        =72-8
        =64
    Answer:94-22-8=64
[5/7 Formula]
    Work: Calculate the value of equation 98-10-15 .
    Question type: Mathematical calculation
    Solution:
          98-10-15
        =88-15
        =73
    Answer:98-10-15=73
[6/7 Formula]
    Work: Calculate the value of equation 12-50-23 .
    Question type: Mathematical calculation
    Solution:
          12-50-23
        =-38-23
        =-61
    Answer:12-50-23=-61
[7/7 Formula]
    Work: Calculate the value of equation 85-31-24 .
    Question type: Mathematical calculation
    Solution:
          85-31-24
        =54-24
        =30
    Answer:85-31-24=30

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>>注：本次最多计算 7 道题。

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