lgx=－2121（（461.9166667/x）－1/373）+lg（101325）
    lgx=－979725.957/x+10.69
    70+975-132
    545+3850-510-3600
    185-(1730-1625)
    76.89-75*e^(-0.018)
    57+4.89-60*e^(-0.018)
    57+4.89-60*0.98
    76.89-75* 0.98
    0.982161031242649*75
    e^（-0.018）
    0.5*3.6%
    (960+100)/110%
    (960+100)/10%
    60%*833.33+40%*1150
    0.6*100/12%
    100/7%
    100/12%
    (20%-4.3%)*19%/(11%-4.3%)
    4.3%+(11%-4.3%)*9%/19%

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