3.85/0.7
    3.85/0.7
    3.85/0.7
    3.85/0.7
    3.85/0.7
    3.85/0.7
    3.85/0.7
    3.85/0.7
    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

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