x^4+5x^2+2x^3=1.6
    x^4-28x^2-336=0
    2b^3-81b^2+2187b-19136=0
    (-2*10^4*x^2+15*10^3)*(8.5*10^6-50*10^6*x^2)-25*10^8=0
    8.1*x^4-999*x^2+24750 = 0
    8.1*x^2-999*x+24750=0
    （-2*10^4*x+15*10^3)*(8.5*10^6-50*10^6*x)-25*10^8=0
    4x²+4x-2023=0
    X-25/4=0.25X
    0=-1/2（x-1）²+2
    x^5+2x^4+3x^3+6x^2-4x-8=0
    2x+3x+4x=45000
    2x+3x+4x=4500
    X-25/4=0.25*X
    1=x/4
    0=1/3（x-1）²+2/3
    32x^4-20x^3+16x^2-5x+2=0
    x*0.45+x*0.45=60
    8x^3-80x^2-5=0
    x×ln（（1.8-x）/（3.82-x））=10.02

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