x2+x-6＜0
    -20x^2+100x+6000≥6000
    abs（3/2x+2）≥5
    abs（2/3x+2）≥5
    36*a^3+60*a^2+29*a+8>0
    (x+3)(x-6)
    (x+3)(x+6)
    (x+6)*(x+6)/(x-1)^(2/3)
    n^2-13n+24<=0
    x2-90x-405
    sqrt(x)>x
    x^2>x
    x-3>3
    (m^2-1)/m^2>0
    2m^2/(m^2-1)≥m
    x-(x/200)*30 =11670.76
    x-(x/200)*30 =1260.63
    x-(x/200)*30 =1003.36
    x-(x/200)*30 =792.86
    x-(x/200)*30 =769.48

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