979-6（6x-1693）=2755-6（10x+125）
    x*x*x-x*x-2=0
    110.7×7.93+12.13x=（110.7+x）×7.98
    x＝8log2 x
    x^2*ln(0.8*1.867/x/1.695)/(1-x)^2/ln(0.2*1.867/6.193/(1-x))=1
    x^2*ln(0.8*1.867/x/1.695)/(1-x)^2/ln(0.2*1.867/(1-x)/6.193)=1
    2X-X-X+X=6
    （120000-x）/120000=0.1
    4X-（3+X）*2=8
    2x-（2+x）*2=10
    4x-（2+x）*2=10
    x^2*ln(0.8*1.866/x/1.695)/(1-x)^2/ln(0.2*1.866/(1-x)/6.193)=1
    x^2*ln(0.8*1.868/x/1.695)/(1-x)^2/ln(0.2*1.868/(1-x)/6.193)=1
    x^2*ln(0.8*1.869/x/1.695)/(1-x)^2/ln(0.2*1.869/(1-x)/6.193)=1
    x^2*ln(0.8*1.864/x/1.695)/(1-x)^2/ln(0.2*1.864/(1-x)/6.193)=1
    x^2*ln(0.8*1.86/x/1.695)/(1-x)^2/ln(0.2*1.86/(1-x)/6.193)=1
    x^2*ln(0.8*1.87/x/1.695)/(1-x)^2/ln(0.2*1.87/(1-x)/6.193)=1
    x^2*ln(0.8*1.88/x/1.695)/(1-x)^2/ln(0.2*1.88/(1-x)/6.193)=1
    x^2*ln(0.8*1.89/x/1.695)/(1-x)^2/ln(0.2*1.89/(1-x)/6.193)=1
    x^2*ln(0.8*1.85/x/1.695)/(1-x)^2/ln(0.2*1.85/(1-x)/6.193)=1

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