6.9*10^(6)*(0.2/512+192.2*25*10^(-6)*512/3637.2)^0.25*3637.2^2*0.72*293/(273.15*512^5)
    6.9*10^(6)*(0.2/259+192.2*25*10^(-6)*205/352)^0.25*352^2*0.72*293/(273.15*259^5)
    6.9*10^(6)*(0.2/205+192.2*25*10^(-6)*205/352)^0.25*352^2*0.72*293/(273.15*205^5)
    1+6%*(92/360)
    1+6%*92/360
    (6%-5%)*3000*92/360
    6.9*10^(6)*(0.2/90+192.2*25*10^(-6)*90/137.5)^0.25*137.5^2*0.72*293/(273.15*90^5)=
    6.9*10^(6)*(0.2/125+192.2*25*10^(-6)*125/137.5)^0.25*137.5^2*0.72*293/(273.15*125^5)=
    6.9*10^(6)*(0.2/70+192.2*25*10^(-6)*70/137.5)^0.25*137.5^2*0.72*293/(273.15*70^5)=
    6.9*10^(6)*(0.2/70+192.2*25*10^(-6)*70/132)^0.25*132^2*0.72*293/(273.15*70^5)=
    arccos(sin21.44/cos38.07)
    arccos(-tan38.07*tan21.44)
    2*3
    ln12.5
    ln13
    ln12
    -1+e^10%*0.5
    e3-6
    （1/tan）1.5
    1/（tan1.5）

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