-1/3x^2*sqrt(4-x^2)=0
    lgx＝2.26
    lgx＝2.2579
    lgx＝2.26
    lgx＝2.26
    （6-t）^2+16=（9-t）^2
    (x^2*ln(0.4*3020/x/4064))/((1-x)^2*ln(0.6*3020/(1-x)/19540))=1
    (x^2*ln(0.51*2600/x/4064))/((1-x)^2*ln(0.49*2600/(1-x)/19540))=1
    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

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