-x^3+20*x-3=0
    1/d+1/(d+1)+1/(d+1)=1/(d+4)
    3x<-3
    18%x+13%（1-x）=16%
    （-3-t-t）^2+(6-2t)^2=(-3-t-3)^2+(3-t)^2
    （15-t-t）^2+(6-2t)^2=(15-t-3)^2+(3-t)^2
    0.2292=-0.72x^2 + 1.6693x + 0.0247
    x^3-10x^2-200x+900=0
    0.3480=-0.72x^2 + 1.6693x + 0.0247
    s^2+3s-3.25=0
    s^2+3s+3.25=0
    0.4264=-0.72x^2 + 1.6693x + 0.0247
    0.4841=-0.72x^2 + 1.6693x + 0.0247
    0.5675=-0.72x^2 + 1.6693x + 0.0247
    360x(550-x/2)-2.39*1000000000
    0.6751=-0.72x^2 + 1.6693x + 0.0247
    0.7906=-0.72x^2 + 1.6693x + 0.0247
    20*（100-0.25x）+0.99*x*10-0.99*x*（100-0.25x）-100*10=0
    0.7744=-0.72x^2 + 1.6693x + 0.0247
    2x^3-4x+7=0

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