32/((40^0.5)*(48^0.5))
    （80.57+31.50+114.00）×12%
    32/((40^0.5)*(48^0.8))
    32/(40^0.5*48^0.8)
    （80.57+31.50）×1×4.35%+114.00×1×1/2×4.35%
    32/(40^(1/2)*48^(1/2))
    32/(40^(1/2)+48^(1/2))
    arccos0.73
    0.05/(0.05+0.0025)
    0.05/(0.05+0.25)
    (0.5*0.05)/(0.5*0.25+0.5*0.05)
    (0.5*0.05)/(0.5*0.95+0.5*0.05)
    0.43 * 0.10/(14*12*321)
    0.43 * 0.10*14*12*321
    14 * 12 * 321
    0.43 * 0.10 * 54144
    7825.568/186624
    7825.568/（186624
    7825.568/(54+3456+288)
    7825.568 / (54*3456*288)

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