（38.5-x）/（255-x）=0.1
    3x²+x-1=0
    3x²+2x-2=0
    0.618x=1415
    0.4126＝-0.0187x^2+0.2971x+0.3291
    0.2662＝-0.0187x^2+0.2971x+0.3291
    0.1545＝-0.0187x^2+0.2971x+0.3291
    0.1255＝-0.0187x^2+0.2971x+0.3291
    0.0778＝-0.0187x^2+0.2971x+0.3291
    x+1＝1
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-800)*0.2=1000
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-800)*0.2=1400
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=1000
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=1400
    X+(X/1.01*0.01)+(((X+(X/1.01*0.01))-(X+(X/1.01*0.01)*0.2)*0.2)=6000
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=6000
    160x+x/2+7（x-1000）+158（x+1000）+x+52（x+500）+x/6+x/12*8+（x-500）/2=4948953.49
    1-logx
    1-1/(1+0.1244x)²=0.847
    18%*X+13%*(1-X)=16%

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