3s^2+14s+10＝0
    0.3s^2+14s+10＝0
    x²+50x+85000=0
    （1/d）+(1/d+1)+（1/d+2）+（1/d+5）=0
    138.2*10^6=1.0*14.3*200x（460-x/2）
    0.9x²-x=0.02
    x^2+1.76x10^-5-1.76x10^-6=0
    x^2+1.76x10^-5x-1.76x10^-6=0
    arctan2.666=x
    arctan8/3=x
    arctan0.5=x
    x*x-1=0
    x*x-sin（x）-1=0
    9x＾11－11x＾10＋2=0
    9x＾11－10x＾10＋2=0
    [2（k-1）]²-4（k²-1）=0
    2.25*x^2+(1-0.5*x)^2*x=100
    x^3=4x-4
    ln2-x
    x^3-x^2-3x-2=0

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