(1680-3A)*A=232279.88
    x(10-x)=42
    X-(X-10000）*3%=11050.73
    X-(X-10000）*10%=11050.73
    X-(X-10000*10%）=11050.73
    X-578.52-（(X-578.52-15000)*10%-2520）=46505.90
    X-674.52-（(X-674.52-15000)*10%-2520）=54945.21
    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

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