2s^3+12s^2+17s+5=0
    x-x/(1+5%)*12%=35000
    x-x/(1+5%)*12%=35000
    x*12%-(1-x)*20%=0
    (X-X/1.09*0.09)-(X-X/1.09*0.09)*0.08=171054.66
    X-(X-5000)*0.09
    (X-X/1.09*0.09)-(X-X/1.09*0.09)*0.082=171054.66
    X-(X/1.09*0.09)=184018.14
    X-(X/1.09*0.09)=184018.14
    X-(X*0.09)=181018.14
    X-(X*0.09)=181018.14
    X-(X*0.09)=181018.14
    X-(X*0.082)=171054.66
    X-(X-5000)*0.03=8000
    x=1-0.375
    -xlnx＝ln0. 99
    0.45/(2.25−x)+0.03/(1−x)+0.033/(0.33-x)+0.084/(0.21-x)=1
    116732.35138/317.5 = 150*x+95*((x^2+1)^0.5-1)/((x^2+1)^0.5+x)-(((x^2+1)^0.5-0.5)*x-((3.14159/2-arctan(1/x))*(x^2+1)/2))*95*95/(317.5*(x+(x^2+1)^0.5)^2)
    65959.6627/205 = 150*x+95*((x^2+1)^0.5-1)/((x^2+1)^0.5+x)-(((x^2+1)^0.5-0.5)*x-((3.14159/2-arctan(1/x))*(x^2+1)/2))*95*95/(205*(x+(x^2+1)^0.5)^2)
    133958.36477/355 = 150*x+95*((x^2+1)^0.5-1)/((x^2+1)^0.5+x)-(((x^2+1)^0.5-0.5)*x-((3.14159/2-arctan(1/x))*(x^2+1)/2))*95*95/(355*(x+(x^2+1)^0.5)^2)

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