0.8x=x
    0.8x=1x
    4*x^2-12*x+5
    54x²-305x+80=0
    X+1/(1-X)+1-1/X=19/6
    X+1/1-X+1-1/X=19/6
    （x²-2x+1)²＝4x²-4x+1
    （x²-2x+1)²＝（1-2x）²
    [（1-x）²]²＝（1-2x）²
    （x-x/1.13*0.1）/7.15=0.0763
     a^2-a-9/4 =
     a^2-a-9/4 =
    42.25+x^2=4x^2+169
    x^2+36x+17=0
    0=368913.33591-1754.10065*x+3.23407*x^2-0.0029*x^3+1.26557e-6*x^4-2.16867e-10*x^5
    2x(x+3)+x=3
    2x^2+7x-3=
    sqrt(18+2*x^2)+sqrt(2*x^2-6*x+9)=3*sqrt(5)
    1*（1+x）∧5=2
    x(50-x)=450

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