82.5-20*lg(5/1)
    arccos0.39642257433300935788906
    97.5-20*lg5
    1+1
    1/（1*2*3）+2/（3*4*5）+3/(5*6*7)+4/(7*8*9)+......+2011/(4021*4022*4023)
    824000/(0.7×16×1272)
    0.25*0.05/0.0345
    0.25*0.05+0.35*0.04+0.4*0.02
    419.82×（3.9-0.6）-92.37-81.93
    (163.8-18.3)×0.36×0.12
    2.1×8.96+2.1×3.6×2+3.3×1.2
    （3.66×7.26+3.36×7.26）×10
    164.76×0.6
    （3.66×7.26+3.36×7.26）×10
    85 -20lg(130/1)
    80 -20lg(130/1)
    85 -20lg(20/1)
    20 -20lg(20/1)
    [3.9×1.3×24+3.6×2.2×2+3.3×1.3×3+（3.9×1.3×17+3.6×2.2+3.3×1.3）×9+2.2×1.8×2+1.28×8.2] ×0.1
    368.94×0.3×0.6

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