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
    p^2-3p+3>1.75
    abs(3x-4)-1<=2
    680-30（25/（1+2x）+1+x）≤380 2＜x≤5
    π/6＜（π/15）t-π/2＜5π/6
     x/1.06*0.06*0.5*0.85 > 0.033*0.85*x
     x/1.06*0.06*0.5*0.85 > 0.026*0.85*x
    (16^-1)^x−0.1<0.25

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