Mathematics
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    20×30-(20x+30x-x²)=551
    20×30-(20x+30x-x2)=551
    40(1-x)²=32.4
    40(1-x)=32.4
    40(1-x)2=32.4
    80-80x-32.4=0
    x²-70x+1200=0
    x2+2x=0
    3*x*x*x*x+6*x*x*x-3*x+1=0
    r*r/100/14*77=0.366*74*24*lg(r/0.175)
    r*r/100/13.40*77=0.366*72*24*lg(r/0.175)
    r*r/100/7.0*43=0.366*76*24*lg(r/0.175)
    r*r/100/7.20*43=0.366*76*24*lg(r/0.175)
    r*r/100/17.20*43=0.366*76*24*lg(r/0.175)
    r*r/100/13.20*77=0.366*77*24*lg(r/0.175)
    r*r/100/23.20*77=0.366*77*24*lg(r/0.175)
    r*r/100/12.76*117=0.366*74*24*lg(r/0.175)
    r*r/100/14.50*77=0.366*79*24*lg(r/0.175)
    r*r/100/12.76*117=0.366*80*24*lg(r/0.175)
    r*r/100/18*117=0.366*80*24*lg(r/0.175)

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