(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)
    （22+223.3）*2*0.8*33
    （22+223.3）*2*0.8
    22*224.3*16.5
    log(1.1236,8.0513)
    (41.68×1000)/(0.808×384)
    = 1.35×(1.0+1.0×1.2×1+1.0×1.2×0.6×26)+1.4×(3+3+2)×1.0×1.2
    (50.99×1000)/(0.808×384)

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