(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
    0.035=-1/xln(1-x)-1
    X/1.06=12075.47
    X/1.13=12075.47
    X-1=1
    11.99c=（3.5+c）×7.92
    36×6.69+11.99c=（36+c）×7.92
    5.0729=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    xx+x=72
    5x=3x+100
    10000+0.1x=0.3x
    0 = 0.0336x - 0.9136
    0 = 0.0321x - 0.8661
     0 = 0.0262x - 0.6977
    0 = 1.4647x + 0.333
    0 = 0.0418x + 7.1139
    0 = 1.1596x - 1.1847
    x-（x*0.1%）=865.55

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