（x-1）/（x+1）=0.62
    3.2/50=x/196710+（（x-1306）/7371.83）^2
    45.57+11.86y=33.05y+111.89
    112.60+11.86y=33.05y+111.89
    11.63*3.14*0.5(x-20)= (2*3.14*0.1185*(417.44-x))/0.5108
    -x=lg(6.15^-0.5*10^-11)
    -x=lg(1.76*10^-5)
    -x=lg(3.52^-0.5*10^-11)
    -x=lg(3.53^-1*10^-10)
    11.63*3.14*0.4(x-20)=(2*3.14*0.1185*(417.44-x))/0.28768
    11.63*3.14*0.65(x-20)=(2*3.14*0.1185*(417.44-x))/0.167
    11.63*3.14*0.4(x-20)=(2*3.14*0.1185*(4.1744-x))/0.28768
    21.9109(x-20)=356.544
    -x=lg(3.8^-0.5*10^-11)
    x=-lg(3.8^-0.5*10^-11)
    18.2591(x-20)=291.47
    x=-lg(10^-14/(3.8^0.5*10^-3))
    14.60728(x-20)=291.47
    x/(50-x)＝10^-0.24
    x/(50-x)＝10^-0.25

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