3.4533=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））
    （17.3-x）（10+x）=173
    （17.3-x）（10+x）=100
    x-467422/x^2+20.68=0
    x-904201.6/x^2=9.498
    x-544449.3/x^2=8.334
    x-544449.3/x^2=65.75
    x-544449.3/x^2=-27.63
    x-544449.3/x^2=29.33
    x-544449.3/x^2=-96.92
    x-544449.3/x^2=-96.92
    3.7859=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））
    (128.5+247)/31*x+241.5/31*(x+15)+124/31(x+30)=1623
    (265+247)/31*x+241.5/31*(x+15)+124/31(x+30)=1623
    12.17c=（3.5+c）×7.98
    (128.5+209.5)/31*x+217/31*(x+15)+124/31(x+30)=1623
    (124+315)/31*x+212/31*(x+15)+93/31(x+30)=1256
    (166.5+273.5)/31*x+217/31*(x+15)+93/31(x+30)=1312
    0.035 =-(1/x)ln(1-x)-1
    0.035=(-1/x)ln(1-x)-1

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