(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)
    1.2×(1.0+1.6×1.0×1+1.6×1.0×0.6×26)+1.4×(3+3+2)×1.6×1.0
    7500-20000*0.073381
    7500-20000*1/20
    15800/0.37-(20000/0.37)*1/20
    （0.7×19.1-0.7×10）×3.12+2×8.3×1.77+0.7×10=

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