t^(3)-50.91t-164.45=0
    x=(1×14.3×800×0.518×915+360×4561.2-290700)/360
    0.084^2=0.06^2*x^2+0.01*(1-x)^2+1.8*0.006*x*(1-x)
    x=(290.70×10^3×4028.4-1×14.3×0.518×915×(915-473.97/2))/(360×(915-65) )
    1/d+1/(d+5)=1/(d+5/2)
    x=1+1/(1300((1024.11×10^6)/(290.70×10^3 )+30)/915) (10.48/1)^2×1
    1/d+1/(d+2)+1/(d+3)=1/(d+5)
    x=1+1/(1300((1024.11×10^6)/(290.70×10^3 )+30)/915) (10.48/0.9)^2×1
    x=(290.70×10^3×3978.4-1×14.3×0.518×815×(815-422.17/2))/(360×(815-65) )
    d^3+7.5*d^2+10.5*d-5=0
    2.43x-0.46 = -0.2393x^2 + 1.2382x
    x=1+1/(1300((1024.11×10^6)/(290.70×10^3 )+30)/815) (10.48/0.9)^2×1
    x^(2)-12x+18＝0
    x^(2)-15x+18＝0
    -(1-x)*(1-x)*lnX=0.2
    2.43x-0.46= 0.0394x^3 - 0.2959x^2 + 1.2564x
    16x^2+30x=34
    1/d+1/(d+5)=1/(d+2.5)
    2.43x-0.46= -0.0038x^4 + 0.0471x^3 - 0.3005x^2 + 1.2573x
    1/(x)+1/(x+5)=1/(x+2.5)

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