s^3+6s^2+11s+3=0
    （1/0.013）*(（（0.5*x）/（0.5+2*x））^(0.667))*((0.0875)^0.5)*(0.5*x)=50.04
    1/2X-4+X/X-2=1/2
    2251/77500=124200*1.62/310000-0.001*x
    2251/77500=0.342+x/2500-124200*1.48/310000
    (0.162y-600)/1000=(1605-0.37y)/2500
    29x+22x×（20-x）=517
    6.48x²＋52.61x-79.55=0
    2X＝6
    1/10=(18-x）/28
    x-x*x/6=0
    x=16510+0.0672x
    X^2-7.7×14.8=0，x
    X^2-15.2×56.6=0，x
    X2-15.2×56.6=0，x
    4（12-3x）^2=（4+x）^2
    （12-3x）^2=1/2（4+x）^2
    （12-3x）^2=（4+x）^2
    8x^2-80x+128=0
    15x^2-104x+128=0

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