3.896*20
    (1276.73+2770.47+322.23)+(606.89+5.056+1000.18+33.646)+0.5[(1011.04+505.52)+(1972.07+2226.27)+2125.765]
    44.955×13.5=
    4.67×4.79×20
    4.35×（28.49×20+2.34×10+4.2×9×2+8.4×4）
    4.36×（2.7×54.6+5×6.2）
    log(3,3.7047)
     1/2*((173.735^2)-173.735^2/(tan71)^2+173.735^2/(sin71)^2)
    1/2((173.735^2)-173.735^2/(tan70)^2+173.735^2/(sin70)^2)
    3336*3.1415926*2/60*0.22
    3336*3.1415926*2/60*0.25
    33360*3.1415926*2/60*0.3
    33360*3.1415926*2/60
    33360*3.1415926*2/60*0.02
    33360*3.1415926*2/60*0.025
    0.029579*33360*3.1415926*2/60
    76140*135*0.8/(21.15*2020*9.8*0.015+1.9*0.233*50*50)
    36548.957458*0.83
    1.4/0.4*287*343.15*(1-(101325/150000)^（0.4/1.4））
    54/4.5797 +54/4.5797 ^2+54/4.5797 ^3+54/4.5797 ^4+54/4.5797 ^5

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