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
    54/（1+0.03）+54/（1+0.03）^2+54/（1+0.03）^3+54/（1+0.03）^4+54/（1+0.03）^5=
    1.14206/4.97316
    184.884767/57.586643
    5.36203/4.97316
    6.401135/5.36203
    2.85514-1.14206
    (2020*9.8*185/3600+1.9*0.233*185*185*185/76140)/0.95=
    76140*135*0.9/(21.15*2020*9.8*0.015+1.9*0.233*50*50)
    76140*135*0.9/(21.15*2020*9.8*0.015+1.9*0.233*50*50*50)
    (665-765lg6.8*10^(-4))/(6.8*10^(-4))
    6153284573721347456325444534245345123652435423435646/491208541298735643296503276132482560212432545408748817485
    6435654347436573553264567352452435×984753265487638497653298
    5.36023/sin(70-19.148314)*sin19.148314
    50*3.14/√44150
    2.85514*(1.16/2)^0.5
    (2.85514+1.14206)/2

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