0.023×(3719.58)^0.8×(4.2)^0.4×0.0932/0.0086
    〖452.59〗^2/(9.8×〖1250〗^2×0.0086)
    ((1-0.72)/0.72)^0.8 (16.61/1250)^0.5
    12/(452.59×245)
    (452.59×0.28×0.0086)/(292.6×〖10〗^(-6) )
    0.105/(4×5.8×〖10〗^(-5) )
    tan78
    23+52
    0.9*360*1018*(715-(302/2))+360*1963*(565-(302/2))
    0.9*360*1884*(1065-(219/2))+360*3430*(965-(219/2))
    0.9*400*1018*(715-(302/2))+400*1963*(565-(302/2))
    0.8/（1+(((0.9*400)/0.0033*2*10)+(0.0044/0.0033)) )
    0.8/1+（(（0.9*400)/0.0033*2*10^5)+（0.0044/0.0033）
    300000*0.003611*0.35/3.14*(sin(3.14*0.3)+sin(3.14*0.65))
    300000*0 0003611*0.35/3.14*(sin(3.14*0.3)+sin(3.14*0.65))
    2/3/3.1415926*0.5*0.4*(sin(3.141593*0.14)^3)
    2/3/3.1415926*0.5*0.4*(sin(3.141593*2)^3)
    2/3/3.1415926*0.5*0.4*(sin(3.141593*0.14)^3
     2/3/3.1415926*11.9*502700*400*(sin(3.1415926*0.14*0.14))^3
    2/3/3.1415926*11.9*502700*400*(sin(3.1415926*0.14*0.14))^(3)

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