X-674.52-（(X-674.52-15000)*10%-2520）=70711.76
    X-674.52-(X-674.52-15000)*10%-2520=70711.76
    X-674.52-(X-674.52-15000)*3%=35370.10
    X-674.52-(X-674.52-10000)*3%=20237.05
    X-674.52-(X-674.52-10000)*3%=16587.62
    0.1 = 14*167.1/(x^(3))+4.3*167.1^(2/3)/(x^(2))+1.1*167.1^(1/3)/x
    0.45 = 14*167.1/(x^(3))+4.3*167.1^(2/3)/(x^(2))+1.1*167.1^(1/3)/x
    0.05 = 14*167.1/(x^(3))+4.3*167.1^(2/3)/(x^(2))+1.1*167.1^(1/3)/x
    0.05 = 14*167.1/x^(3)+4.3*167.1^(2/3)/x^(2)+1.1*167.1^(1/3)/x^(1)
    0.05=14*167.1/x^(3)+4.3*167.1^(2/3)/x^(2)+1.1*167.1^(1/3)/x^(1)
    1/x=x-2
    tan(x)=1.135
    x-12%/18%-x=230/78
    0.854=0.9/(0.077*x)+1/tan(0.0385*x)+(1/(tan(0.0385*x)*tan(0.0385*x))+1+(2.1/(0.077*x))^2)^0.5
    12.14x=(3.5+x)*7.98
    -0.5x(x-3)²＝x-1
    0.5x(x-3)²＝x-1
    7X+1=8X-2
    6.9x－390＝（6x－600）（1＋20%）
    (20-x)(38-x)=544

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