-x^2+54x-720=0
    k*lg(k)/lg(2)*sqrt(k)=10^(11)
    t²－4t－6＝0
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1=0
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1=
    16（y-1/4）^4+16（y-1/4）^3-4（y-1/4）^2-4（y-1/4）+1=0
    x^2-500x+600=0
    -(x^2) /200+2.5x=3
    X^2=-1
    X^3+X^2+X=0
    X^3+X^2+X+1=0
    4X^3+3X^2+2X+1=0
    X^3+2X^2+3X+4=0
    400 x*x - 720x + 348 = 0
    180/x-2/3=1+(180-x)/1.5/x
    180/x-2/3=1+(180-x)/1.5/x

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