1800=（x-4）(-50x+1200)
    (x^2*ln(0.64*2729/x/4064))/((1-x)^2*ln(0.36*2729/(1-x)/19540))=1
    x-2x=100
    r*r/100/12.0=0.366*80*24*(lg(r)-lg0.175)/117
    (x-20)(50-(x-180)/10)=9450
    x^-4/3
    (x-20)(50-(x-180))=9450
    7600/x+40000/(x+60)=150
    x^2=5
    15910486196=x
    7600/x+30000/(x+60)=150
    7600/x+30000/(x+60)=150
    7500/x+30000/(x+60)=150
    7500(x+60)+30000x=150x(x+60)
    7500(x+60)+3000x=150x(x+60)
    r*r/100/14.50=0.366*50*24*(lg(r)-lg0.175)/77
    r*r/100/8.50/8.50=0.366*50*24*(lg(r)-lg0.175)/77/8.50
    r*r/100/8.50/8.50=0.366*80*24*(lg(r)-lg0.175)/77/8.50
    log(3,(2x-1))
    r*r/100/10.50/10.50=0.366*80*24*(lg(r)-lg0.175)/77/10.50

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