0.5^x%18^(1/3)
    x^0.5%3<3^x-18^(1/3)
    t^2-t-4>0
    log(2,X)>(1+√17)/2
    2*x/3+1/3<0.5*x+2.5
    0.5*x+1.5<2*x-6
    42
    4>x>2
    x(x-10)(x+45)>=0
    x^2-35*x-450<0
    2^x>-2/3*x^2+8/3
    {1+lg[(1+x)/(1-x)]/1-lg[(1+x)/(1-x)]}>(1-lg2)/(1+lg2)
    {1+[lg(1+x)/(1-x)/1-[lg(1+x)/(1-x)]}>(1-lg2)/(1+lg2)
    （x-3）/（x-1）≤0
    inx＞0
    4/a-4>3a
    60≤1600÷y-y≤84
    16+k>0
    25-k>0
    x+1/1-x>3x+1

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