e2/4-0.75
    =1.9×0.39×182.75/(2×〖10〗^5 )×（1.9×40+0.08×25/0.01）
    0.131×150×280×9.6/360
    0.048×1100×280×9.6/360
    0.186×150×280×9.6/360
    0.104×1100×280×9.6/360
    1-√(1-2×0.122)
    1-√(1-2×0.047)
    1-√(1-2×0.169)
    1-√(1-2×0.099)
    (13.72×10^6)/(1.0×9.6×150×280^2)
    (39.25×10^6)/(1.0×9.6×1100×280^2)
    (69.9×10^6)/(1.0×9.6×150×280^2)
    (82.12×10^6)/(1.0×9.6×1100×280^2)
    (82.12×106)/(1.0×9.6×1100×2802)
    1/3×52.2×3.3-2/3×64.43
    1/3×52.2×3.3-1/3×64.43
    1/3(52.2+42)×3.3-64.43
    1/3（52.2+42）3.3-73.94+1/3（-89.07+73.94）
    1/3(52.2+42)3.3-73.94+2/3(-89.07+73.94)

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