(206.1×0.25)/(〖0.25〗^2×6)
    (38013.36+50240+55654)/(122909.86+0)
    （1740.89-3.14×1.25×1.25×32）×10×7.76
    (38013.36+50240+55654)/(130829.31+0)
    278.27×1×200
    3.14×2.5×1×200×32
    √(〖62.2〗^2+3×〖38.6〗^2 )
    (453×10^3×2751000)/(1075030806×30)
    (453×10^3×3154680)/(1075030806×30)
    (206.1×10^6)/3315949.4
    (206.1×10^6)/7373325.1
    1075030806/(470-324.2-30)
    1075030806/324.2
    1075030806/(470-324.2)
    700×30×(146-15)
    700×30×(146-15)+2×30×(146-30)×(146-30)/2
    (38013.36+37680+41740.5)/(130829.31+0)
    （1740.89-3.14×1.25×1.25×32）×10×8.26
    3.14×2.5×1×150×32
    278.27×1×150

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