r*r/100/117*15=0.366*45*24*lg(r/0.175)
    x^2+6x-720=0
    x^2+6x+720=0
    r*r/100/12*43=0.366*44*24*lg(r/0.175)
    300x－2x²－22400÷12=0
    r*r/100/27*80=0.366*44*24*lg(r/0.175)
    r*r/100/25*80=0.366*46*24*lg(r/0.175)
    r*r/100/25*60=0.366*46*24*lg(r/0.175)
    r*r/100/20*70=0.366*46*24*lg(r/0.175)
    r*r/100/27*70=0.366*46*24*lg(r/0.175)
    r*r/100/27*43=0.366*46*24*lg(r/0.175)
    r*r/100/27*43=0.366*42*24*lg(r/0.175)
    r*r/100/27*43=0.366*50*24*lg(r/0.175)
    r*r/100/27*43=0.366*40*24*lg(r/0.175)
    r*r/100/27*43=0.366*44*24*lg(r/0.175)
    r*r/100/23.20*77=0.366*44*24*lg(r/0.175)
    r*r/100/24*77=0.366*43*24*lg(r/0.175)
    r*r/100/27.0*30=0.366*44*24*lg(r/0.175)
    r*r/100/27.0*50=0.366*44*24*lg(r/0.175)
    r*r/100/20.0*43=0.366*44*24*lg(r/0.175)

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