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)
    0.3*X^2-1.1*X+1=0
    2.43x-0.46= -0.0038x4 + 0.0471x3 - 0.3005x2 + 1.2573x
    68x^2-118x+25=0
    2x+5x=20
    68x2-118x+25=0
    arctan0.2x+arctan0.5x+arctan2x=90
    0.25xx+x=4

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