(334.02×10^3)/(500×20)
    (2×314806)/(2×π×0.3)
    (2×314.8)/(2×π×0.3)
    314806/(39.7×10^3 )
    180914919/(0.93×1138750×215)
    135808831/(0.71×1138750×215)
    (180985×656300)/(227750000×8)
    180914919/(1.05×1138800)
    [1.0×(0.71+0.89+2.13)×1.7+1.0×0.64]/2
    [1.0×(0.71+0.89+2.13+39)×1.7+1.0×0.64]/2
    [1.0×(0.71+0.89+2.13+39)×1.7+1.2×0.64]/2
    [1.0×(2.5+2+2)×1.7]/2
    C(60, 9)
    (3.8/2000)*1000
    (3.8/470)*1000
    3.8/470
    3.8/2000
    (470*2000)/(470+2000)
    80×2^(1+2)
    2-2

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