4.6850=（（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））
    (1-x)^2
    x^2-(1-x)^2=9
    -1/y=（y-2）
    x÷（7008+x）=0.995
    x÷7008=0.995
    x/1.13*0.13-1.035
    x÷（7008-x）=0.995
    (x/1.13*0.13-1.035)*0.12
     lnx = -2.156
    (x/1.13+7.964)*0.0003
    lnx = -1.089
    lnx = -1.466
    (x/1.13-7.964-(x/1.13*0.13-1.035)*0.12-(x/1.13+7.964)*0.0003)*0.05
    7.964*5% = x/1.13-7.964-(x/1.13*0.13-1.035)-(x/1.13*0.13-1.035)*0.12-(x/1.13+7.964)*0.0003-{(x/1.13-7.964-(x/1.13*0.13-1.035)*0.12-(x/1.13+7.964)*0.0003)*0.05}
    lnx=-0.336
    lnx=-1.78
    lnx=-0.022
    lnx=-4.60517
    1.1561*x - 0.0011=0.3

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