-1/a>=3
    1.2（-x+2）-0.6<=2.1(8x+3)+1.5
    x^2-12x+71/2>0
    (x-1)x(x-2)>0
    (x-1)(x+5)(x-6)>0
    2×x×x+3×x-2＞0
    5×x×x+24×x-5＞0
    5×x×x+24×x-5＜0
    2×x×x+3×x-2＜0
    978x^2+[(110-4x)(50.5-4x)+(146.5-4x)(182-4x)]*x>64300
    x^4-3x^3+2x^2>0
    1+1╱（2-x）≤0
    1+（2-x）╱1≤0
    928*cosx+1950*sinx≤1090
    1.0*27<=22.4*1000*x*(0.184-x/2)
    1.0*8.67<=22.4*1000*x*(0.184-x/2)
    e^x+x^2-x^3>1
    -x^2+7x＞13
    x^2+2x-32>0
    x2+2x-32>0

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