2*3.1415926/18*60/(16928.3*2*3.1415926)
    14.76*0.94*0.9*0.85
     60/4.066
    60/4.71
    tan（ π/2）
    tan π/2
    1.92*2
    146.8 + 97.16
    2.45 + 1.62
    225/4 + 225/5.5
    45+150+30
     6.8+30+15*4+15*2+20
    ln(1+0.399341)*8*0.651653*5.151*10^(-5)/1000
    101325/((8315/26.7382)*500)
    101325/((8315/26.7382)*26.7382)
    0.5*(24.6263+28.85)
    0.39*18.02+(1-0.39)*28.85
    0.285378/(1-0.285378)
    ^1.24-(0.45*0.24+1)
    (8518/(1+0.2))*0.2

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