(22.58×10^3)/(0.632×571)+(0.143×10^6)/(7.7×10^3 )
    22.82×1000/(0.632×5.71×10^2)
    1890/20.1
    1.05×0.9×1+2×0.7×0.65
    1.05×1.2×1.5
    33*31+42*18+85*4+32
    21/0.64
    1+2×0.7×0.31
    [1.2×(65.13+5+0.135+0.27+0.267)+1.4×(3.0+2.0+2.0)]×0.6×0.9
    [1.2×(65.13+5+0.135+0.27+0.267)+1.4×(3.0+2.0+2.0)]
    61*54*35
    (22.58×10^3)/(0.625×571)+(0.143×10^6)/(7.7×10^3 )
    [1.2×(65.39+5+0.135+0.27+0.267)+0.9×1.4×(3.0+2.0+2.0)]×0.2×1.2
    22.82×1000/(0.625×5.71×10^2)
    6*(170/17.9*10^6)^(-7/8)*(0.22/2)^(1/8)*20
    1910/20.1
    1+2×0.7×0.65
    [1.2×(65.39+5+0.135+0.27+0.267)+1.4×(3.0+2.0+2.0)]×0.2×1.2
    26×2.45
    26×2.58

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