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

[1/4 Formula]
    Work: Calculate the value of equation 25×(200+4) .
    Question type: Mathematical calculation
    Solution:
          25×(200+4)
        =25×204
        =5100
    Answer:25×(200+4)=5100
[2/4 Formula]
    Work: Calculate the value of equation 309+102÷(42-25) .
    Question type: Mathematical calculation
    Solution:
          309+102÷(42-25)
        =309+102÷17
        =309+6
        =315
    Answer:309+102÷(42-25)=315
[3/4 Formula]
    Work: Calculate the value of equation 420÷(15×(43-39)) .
    Question type: Mathematical calculation
    Solution:
          420÷(15×(43-39))
        =420÷(15×4)
        =420÷60
        =7
    Answer:420÷(15×(43-39))=7
[4/4 Formula]
    Work: Calculate the value of equation 12×(324-285)÷26 .
    Question type: Mathematical calculation
    Solution:
          12×(324-285)÷26
        =12×39÷26
        =468÷26
        =18
    Answer:12×(324-285)÷26=18

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