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

[1/7 Formula]
    Work: Calculate the value of equation 669-(253-31) .
    Question type: Mathematical calculation
    Solution:
          669-(253-31)
        =669-222
        =447
    Answer:669-(253-31)=447
[2/7 Formula]
    Work: Calculate the value of equation 772-(36-28) .
    Question type: Mathematical calculation
    Solution:
          772-(36-28)
        =772-8
        =764
    Answer:772-(36-28)=764
[3/7 Formula]
    Work: Calculate the value of equation 732-(136-68) .
    Question type: Mathematical calculation
    Solution:
          732-(136-68)
        =732-68
        =664
    Answer:732-(136-68)=664
[4/7 Formula]
    Work: Calculate the value of equation 556-(128-44) .
    Question type: Mathematical calculation
    Solution:
          556-(128-44)
        =556-84
        =472
    Answer:556-(128-44)=472
[5/7 Formula]
    Work: Calculate the value of equation 457-(135-43) .
    Question type: Mathematical calculation
    Solution:
          457-(135-43)
        =457-92
        =365
    Answer:457-(135-43)=365
[6/7 Formula]
    Work: Calculate the value of equation 765-(230-35) .
    Question type: Mathematical calculation
    Solution:
          765-(230-35)
        =765-195
        =570
    Answer:765-(230-35)=570
[7/7 Formula]
    Work: Calculate the value of equation 762-(36-38) .
    Question type: Mathematical calculation
    Solution:
          762-(36-38)
        =762-(-2)
        =764
    Answer:762-(36-38)=764

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>>注：本次最多计算 7 道题。

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