Overview: 5 questions will be solved this time.Among them
           ☆5 arithmetic calculations

[1/5 Formula]
    Work: Calculate the value of equation 0.2*(0.3+0.4+0.5+0.9)*(0.9-0.1) .
    Question type: Mathematical calculation
    Solution:
          0.2*(0.3+0.4+0.5+0.9)*(0.9-0.1)
        =0.2*2.1*(0.9-0.1)
        =0.2*2.1*0.8
        =0.42*0.8
        =0.336
    Answer:0.2*(0.3+0.4+0.5+0.9)*(0.9-0.1)=0.336
[2/5 Formula]
    Work: Calculate the value of equation 0.2*(0.3+0.3+0.4+0.9)*(4.2-0.1) .
    Question type: Mathematical calculation
    Solution:
          0.2*(0.3+0.3+0.4+0.9)*(4.2-0.1)
        =0.2*1.9*(4.2-0.1)
        =0.2*1.9*4.1
        =0.38*4.1
        =1.558
    Answer:0.2*(0.3+0.3+0.4+0.9)*(4.2-0.1)=1.558
[3/5 Formula]
    Work: Calculate the value of equation 0.2*(0.3+0.3+0.4+0.9)*(0.9-0.1) .
    Question type: Mathematical calculation
    Solution:
          0.2*(0.3+0.3+0.4+0.9)*(0.9-0.1)
        =0.2*1.9*(0.9-0.1)
        =0.2*1.9*0.8
        =0.38*0.8
        =0.304
    Answer:0.2*(0.3+0.3+0.4+0.9)*(0.9-0.1)=0.304
[4/5 Formula]
    Work: Calculate the value of equation 0.2*(0.3+0.3+0.4+0.9)*(4.2-0.1) .
    Question type: Mathematical calculation
    Solution:
          0.2*(0.3+0.3+0.4+0.9)*(4.2-0.1)
        =0.2*1.9*(4.2-0.1)
        =0.2*1.9*4.1
        =0.38*4.1
        =1.558
    Answer:0.2*(0.3+0.3+0.4+0.9)*(4.2-0.1)=1.558
[5/5 Formula]
    Work: Calculate the value of equation 0.2*(0.3+0.3+0.4+0.9)*(3.3-0.12) .
    Question type: Mathematical calculation
    Solution:
          0.2*(0.3+0.3+0.4+0.9)*(3.3-0.12)
        =0.2*1.9*(3.3-0.12)
        =0.2*1.9*3.18
        =0.38*3.18
        =1.2084
    Answer:0.2*(0.3+0.3+0.4+0.9)*(3.3-0.12)=1.2084

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