（2k+1）^2-4(k+0.5)>0
    x^2-15*x-2000<0
    m^2+6*m-2<0
    9*m^2+38*m+9<0
    1.2（y－6）＋0.5y≤40
    1.2y＋0.5（y－6）≤40
    1.2y＋0.5（y＋6）≤40
    (-1)^x＞0
    log(x,-x)＞0
    lgx＞ln(-x)
    lg-absx＞-1000
    A(4,x)＞100
    !(x)＞3
    2.7^x-1≤x
    2.72^x-1≤x
    2.718^x-1≤x
    ex-1≤x
    sinx＜x＜tanx
    lgx＜-30
    lgx＜acosx

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