7.2*8
    71.2/8
    6.8*0.7
    75*20%
    (910×7×3.5+850×7×40.5+4×909×7×498.5)/(910×7+850×7+4×909×7)
    √((9.09×2563.92×10^6)/(1000×1.43))
    √((9.09×2563920)/(1000×1.43))
    -0.05614×53.6×〖29.19〗^2
    -0.06788×53.6×〖22.95〗^2
    0.01384×53.6×〖29.19〗^2
    0.0281×53.6×〖22.95〗^2
    10×7.76-24×1
    √(〖(50.4/347.2)〗^2+〖(137.4/560)〗^2 )
    (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 )

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