(57800-0.3×38500)/(0.9×0.598×300)
    38600/(0.8×0.76×300)
    78900/(0.9×0.598×300)+38600/(0.8×0.76×300)
    √((19.28/1.22)^2+〖32.65〗^2 )
    (82.3×1000)/(7×360)
    (48.6×1000)/(7×360)
    √((12.39/1.22)^2+〖12.29〗^2 )
    (48.2×1000)/(7×560)
    (48.6×1000)/(7×560)
    √((11.97/1.22)^2+〖11.87〗^2 )
    (48.2×1000)/(7×580)
    225.36×17.30+363.83×12.30+1472.75×2.77+35.15×7.40-13.92×18.23-125.22×16.21-517.47×11.19-186.84×7.78-1336.55×3.26=
    (48.6×1000)/(7×580)
    168.86÷（28.3*10^(-6) ）*0.222
    (48200-0.3×48600)/(0.9×0.598×300)
    48600/(0.8×0.76×300)
    log(1.06,2.20264)
    10430.4*10^(-6)*33*（22+223.3）*2
    log(0.06,2.20264)
    82300/(0.9×0.598×300)+48600/(0.8×0.76×300)

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