1.5√18
    √(〖126.95〗^2+3×〖0.01〗^2 )
    (199.7×10^3×160)/(316220606.06×2×10)
    [400×10×(168.8-5)]+[2×10×460×(460/2-301.2)]
    (199.7×10^3×907374.4)/(316220606.06×2×10)
    (139.94×10^6)/(1.05×1049869.21)
    (39.94×10^6)/(1.05×1873344.82)
    316220606.06/301.2
    316220606.06/(470-301.2)
    400×10×(168.8-5)+2×10×(460-301.2)×(460-301.2)/2
    199.7×0.20
    0.1×16.7×(2.3×300^2+100×480)
    272.84/1.2
    32.25×18×470
    √((49.93/253.23)^2+(66.57/408.5)^2 )
    817×500
    (39.94×10^6×150)/90000
    199.7×0.20
    4×22500
    ［2046×（1+0.0465）×1.1080×1.3612+0］×0.9899

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