Overview: 4 questions will be solved this time.Among them
           ☆4 arithmetic calculations

[1/4 Formula]
    Work: Calculate the value of equation 2356-(1356-721) .
    Question type: Mathematical calculation
    Solution:
          2356-(1356-721)
        =2356-635
        =1721
    Answer:2356-(1356-721)=1721
[2/4 Formula]
    Work: Calculate the value of equation 1235-(1780-1665) .
    Question type: Mathematical calculation
    Solution:
          1235-(1780-1665)
        =1235-115
        =1120
    Answer:1235-(1780-1665)=1120
[3/4 Formula]
    Work: Calculate the value of equation 700-82-18 .
    Question type: Mathematical calculation
    Solution:
          700-82-18
        =618-18
        =600
    Answer:700-82-18=600
[4/4 Formula]
    Work: Calculate the value of equation 62*4+44*5+5*18 .
    Question type: Mathematical calculation
    Solution:
          62*4+44*5+5*18
        =248+44*5+5*18
        =248+220+5*18
        =248+220+90
        =468+90
        =558
    Answer:62*4+44*5+5*18=558

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