（X-1/X）^3
    297X=280+150X
     3.6=81x+9
    0.28x=0.26
    x(1-x)=2x-2
    x^2+4x-2=0
    x^2-6x-3+0
    4x^2-1=0
    231x^2-2x-10
    2y^2+5y=y+2
    2x^2+1=3x
    9x^2-(x-1)^2=0
    （x-1)^2=2(x-1)
    x^2-6x+5=0
    4*x^5-12*x^4+2*x^3+3*x^2-5*x-3=0
    x/(x+100)=0.5
    x/(100+x) = 0.1042
    x/(100+x) = 0.0794
    x/(100+x) = 0.0348
    x/(100+x) = 0.0982

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