2x>2x
    cosx-sinx>0
    −1excos(x)−1exsin(x)>0
    x^(-2)+x^(-1)>2
    abs(r-5)
    sqrt（10）
    2290-30(x-11)≥2200
    cosx-2x＞0
    cosx-2x＞0
    (2x+3)/(3X-2)<1
    (x-2)/(x+1)>=0
    (x^2-9)/(x-2)>0
    1/5（x-100+4500/x）<=9
    x+4500/x＜=145x
    x+4500/x＜145x
    4800-80×√(60×60-x×x)＜0.5x×√（60×60-x×x）
    3x+5／x-1≧x
    1/(x×0.85)＜0.78
    1/(x×0.85)＜0.75
    3^x+2 -2 >=0

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