（84.53+102.36）*1.2/5
    √(〖42.44〗^2+3×20^2 )
    (240×10^3)/(2×300×20)
    (254.65×10^3)/(300×20)
    (2×240)/(2×π×0.3)
    240/62.65
    2.809-(2.755+2.573)/2
    (9.3×10^6)/(0.94×236865.58×215)
    (9.3×10^6)/(0.94×236865.58×215)
    (9.3×10^6)/(0.94×236865.58×215)
    1.07-〖75.92〗^2/44000
    1600/21.076
    3.286-(2.810+2.790)/2
    √(〖39.97〗^2+3×〖18.83〗^2 )
    (226×10^3)/(2×300×20)
    (239.79×10^3)/(300×20)
    (2×226)/(2×π×0.3)
    226/62.65
    2.697-(2.679+2.519)/2
    (12.5×10^6)/(0.90×236865.58×215)

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