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

[1/4 Formula]
    Work: Calculate the value of equation 1+0.9+0.8+0.7+0.6+0.5+0.4+0.3+0.2+0.1 .
    Question type: Mathematical calculation
    Solution:
          1+0.9+0.8+0.7+0.6+0.5+0.4+0.3+0.2+0.1
        =1.9+0.8+0.7+0.6+0.5+0.4+0.3+0.2+0.1
        =2.7+0.7+0.6+0.5+0.4+0.3+0.2+0.1
        =3.4+0.6+0.5+0.4+0.3+0.2+0.1
        =4+0.5+0.4+0.3+0.2+0.1
        =4.5+0.4+0.3+0.2+0.1
        =4.9+0.3+0.2+0.1
        =5.2+0.2+0.1
        =5.4+0.1
        =5.5
    Answer:1+0.9+0.8+0.7+0.6+0.5+0.4+0.3+0.2+0.1=5.5
[2/4 Formula]
    Work: Calculate the value of equation 0.1×1.3+0.2×1.2+0.3×1.1+0.4×1+0.5×0.9 .
    Question type: Mathematical calculation
    Solution:
          0.1×1.3+0.2×1.2+0.3×1.1+0.4×1+0.5×0.9
        =0.13+0.2×1.2+0.3×1.1+0.4×1+0.5×0.9
        =0.13+0.24+0.3×1.1+0.4×1+0.5×0.9
        =0.13+0.24+0.33+0.4×1+0.5×0.9
        =0.13+0.24+0.33+0.4+0.5×0.9
        =0.13+0.24+0.33+0.4+0.45
        =0.37+0.33+0.4+0.45
        =0.7+0.4+0.45
        =1.1+0.45
        =1.55
    Answer:0.1×1.3+0.2×1.2+0.3×1.1+0.4×1+0.5×0.9=1.55
[3/4 Formula]
    Work: Calculate the value of equation 1+(((77×78-6)-5679)÷107+30)×37 .
    Question type: Mathematical calculation
    Solution:
          1+(((77×78-6)-5679)÷107+30)×37
        =1+((6000-5679)÷107+30)×37
        =1+(321÷107+30)×37
        =1+33×37
        =1+1221
        =1222
    Answer:1+(((77×78-6)-5679)÷107+30)×37=1222
[4/4 Formula]
    Work: Calculate the value of equation 12-(0.2×(3+1.5)+1.1)÷(7.5-(3-2.5)×5) .
    Question type: Mathematical calculation
    Solution:
          12-(0.2×(3+1.5)+1.1)÷(7.5-(3-2.5)×5)
        =12-(0.2×4.5+1.1)÷(7.5-(3-2.5)×5)
        =12-2÷(7.5-(3-2.5)×5)
        =12-2÷(7.5-0.5×5)
        =12-2÷5
        =12-0.4
        =11.6
    Answer:12-(0.2×(3+1.5)+1.1)÷(7.5-(3-2.5)×5)=11.6

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