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

[1/4 Formula]
    Work: Calculate the value of equation 1.1×1×0.9+1×0.9×0.8+0.9×0.8×0.7+0.8×0.7×0.6 .
    Question type: Mathematical calculation
    Solution:
          1.1×1×0.9+1×0.9×0.8+0.9×0.8×0.7+0.8×0.7×0.6
        =1.1×0.9+1×0.9×0.8+0.9×0.8×0.7+0.8×0.7×0.6
        =0.99+1×0.9×0.8+0.9×0.8×0.7+0.8×0.7×0.6
        =0.99+0.9×0.8+0.9×0.8×0.7+0.8×0.7×0.6
        =0.99+0.72+0.9×0.8×0.7+0.8×0.7×0.6
        =0.99+0.72+0.72×0.7+0.8×0.7×0.6
        =0.99+0.72+0.504+0.8×0.7×0.6
        =0.99+0.72+0.504+0.56×0.6
        =0.99+0.72+0.504+0.336
        =1.71+0.504+0.336
        =2.214+0.336
        =2.55
    Answer:1.1×1×0.9+1×0.9×0.8+0.9×0.8×0.7+0.8×0.7×0.6=2.55
[2/4 Formula]
    Work: Calculate the value of equation 1.11×2.22×3.33×4.44÷5.55÷6.66×(1-0.37×3+0.11) .
    Question type: Mathematical calculation
    Solution:
          1.11×2.22×3.33×4.44÷5.55÷6.66×(1-0.37×3+0.11)
        =1.11×2.22×3.33×4.44÷5.55÷6.66×0
        =2.4642×3.33×4.44÷5.55÷6.66×0
        =8.205786×4.44÷5.55÷6.66×0
        =36.43369÷5.55÷6.66×0
        =6.564629÷6.66×0
        =0.98568×0
        =0
    Answer:1.11×2.22×3.33×4.44÷5.55÷6.66×(1-0.37×3+0.11)=0
[3/4 Formula]
    Work: Calculate the value of equation (1-0.25)÷(12×(1-0.75)+1.5×0.6)×(1.2-0.6÷20)+1.5×2.5 .
    Question type: Mathematical calculation
    Solution:
          (1-0.25)÷(12×(1-0.75)+1.5×0.6)×(1.2-0.6÷20)+1.5×2.5
        =0.75÷(12×(1-0.75)+1.5×0.6)×(1.2-0.6÷20)+1.5×2.5
        =0.75÷(12×0.25+1.5×0.6)×(1.2-0.6÷20)+1.5×2.5
        =0.75÷3.9×(1.2-0.6÷20)+1.5×2.5
        =0.75÷3.9×1.17+1.5×2.5
        =0.192308×1.17+1.5×2.5
        =0.225+1.5×2.5
        =0.225+3.75
        =3.975
    Answer:(1-0.25)÷(12×(1-0.75)+1.5×0.6)×(1.2-0.6÷20)+1.5×2.5=3.975
[4/4 Formula]
    Work: Calculate the value of equation 1.1+1.91+1.991+1.9991+1.99991+1.999991+1.9999991+1.99999991 .
    Question type: Mathematical calculation
    Solution:
          1.1+1.91+1.991+1.9991+1.99991+1.999991+1.9999991+1.99999991
        =3.01+1.991+1.9991+1.99991+1.999991+1.9999991+1.99999991
        =5.001+1.9991+1.99991+1.999991+1.9999991+1.99999991
        =7.0001+1.99991+1.999991+1.9999991+1.99999991
        =9.00001+1.999991+1.9999991+1.99999991
        =11.000001+1.9999991+1.99999991
        =13+1.99999991
        =15
    Answer:1.1+1.91+1.991+1.9991+1.99991+1.999991+1.9999991+1.99999991=15

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