√(〖(56.63/347.2)〗^2+〖(150.7/560)〗^2 )
    (206.1×0.456)/(〖0.228〗^2×4+〖0.456〗^2×2)
    (206.1×0.456)/(〖0.228〗^2×4+〖0.456〗^2×2)
    (206.1×0.456)/(〖0.228〗^2×4+〖0.456〗^2×2)
    (206.1×0.456)/(〖0.228〗^2×4+〖0.456〗^2×2)
    √(〖21.4〗^2+3×〖22.2〗^2 )
    (453×10^3×6038400)/(4114532144×30)
    (453×10^3×8252185.8)/(4114532144×30)
    (206.1×10^6)/9608902.7
    (206.1×10^6)/16340477.1
    4114532144/(680-428.2-30)
    4114532144/428.2
    4114532144/(680-428.2)
    850×30×(251.8-15)
    850×30×(251.8-15)+3×30×(251.8-30)×(251.8-30)/2
    √((46.5/1.22)^2+〖16.8〗^2 )
    (206.1×10^6×421.9)/(18.72×10^8 )
    (206.1×10^6×264.1)/(18.72×10^8 )
    (9sqrt(2)+6sqrt(3)-3sqrt(6)-12)/(2-sqrt(2)+sqrt(6))
    ［1387×（1+0.0518）×1.1034×1.3612+0］×0.9839

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