(254×10^3)/(0.997×4851.9×215)+(1.0×12.2×10^6)/(1.15×401449.28×(1-(0.8×254)/467452.94)×215)
    (254×10^3)/(0.997×4851.9×215)+(1.0×12.2×10^6)/(1.15×401449.28×(1-(0.8×254)/467452.94)×215)
    (π^2×2.06×10^5×4851.9)/(1.1×〖4.38〗^2 )
    445/101.70
    atan(0.73)
    sin50
    sin40
    atan(0.35)
    atan(1.4)
    2/sqrt(7)
    sqrt(7)
    1.07-〖18.51〗^2/44000
    445/24.04
    0.5×890
    (1.8×10^6)/(0.89×39661×215)
    1.07-〖88.21〗^2/44000
    1250/14.17
    0.542-0.276
    0.542-0.517
    70000÷（1-30%）

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