x(x+2)=1.99
    ln(x+3)=1
    9╱8（3╱2X＋500）+400=2X
    24（18X＋500）+400=54X
    y=0.09*x^2 - 10^(-14)*x + 9*10^(-14) x=10.385
    0.09*x^2 - 10^(-14)*x + 9*10^(-14)-0.002*x^4 + 0.1418*x^3 - 3.3715*x^2 + 32.642*x - 130.51=0
    0.09*x^2 - 10^(-14)*x + 9*10^(-14)+0.0452*x^3 +0.0299*x^2 - 1.3211*x - 69.278=0
    2x^2-3x+1=0
    0.09*x^2 - 10^(-14)*x + 9*10^(-14)+0.0194*x^3 + 0.1089*x^2 - 0.2365*x -49.971=0
    0.35*x*x+x+0.35=0
    0.09*x^2 - 10^(-14)*x + 9*10^(-14)+0.0395x^3 -0.2932x^2 - 0.226*x - 19.98=0
    0.09*x^2 - 10^(-14)*x + 9*10^(-14) +0.0395x^3 -0.2932x^2 - 0.226*x - 19.98=0
    1.1*4023850 ≤22.4*10^6*0.5*x*(2.1-x/2)
    s(s^2+0.4s+1)
    (3x^2-6x+3)(x^3-3x^2)
    s^2+0.4s+1
    x*x=1
    2025000+16*x*x*x*x+36900*x*x=0
    -244.785*x^4+744.36*x^3-742.47*x^2+271.66*x+19.045=0
    1.1*9260100≤22.4*10^6*2.2*x*(2.08-x/2)

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