(3.14 * 0.1 * 4.0 * 200*1.2) / 2.0
    (3.14 * 0.22 * 3.0 * 300) / 2.0
    sqrt(2+sqrt(2))
    1561.00×［1-1/（1+8.0%）^23.42］
    （1+0.002）^12
    3+3
    178.2*10^6/(0.9*360*1904)
    178.2*10^6/(14.3*4200*1904*1904)
    √(〖155.97〗^2+3×〖0.079〗^2 )
    (811.0×10^3×760)/(389923687.94×2×10)
    500×20×(117.7-10)+2×10×440×(440/2-342.3)
    [500×20×(117.7-10)]+[2×10×440×(440/2-342.3)]
    [500×20×(117.7-10)]+[2×10×(440-342.3)×(440-342.3)/2]-[2×10×342.3×342.3/2]
    (811.0×10^3×1077000)/(389923687.94×2×10)
    (186.53×10^6)/(1.05×3312860.56)
    (186.53×10^6)/(1.05×1139128.51)
    500×20×(117.7-10)
    389923687.94/(440-342.3)
    389923687.94/342.3
    389923687.94/(460-342.3)

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