10/a-10≤a
    5-x>=2
    x^1/6＜x^1/3
    x^2-2x＜0
    (3-2x)*(3-2x)<=4
    （3-2x）*(3-2x)>4
    1/x＞－4
    1/2x+2>1/3
    -1/3>1/2x+2
    -1/2x-1/3>2
    1/2x>-7/3
    5>x
    x^2-2*x-3<=0
    2x>lnx
    x-1<1.01*ln(x)
    [8-（x-2.5/0.1）×0.2]x ≥20
    [8-（x-2.5/0.1）×0.2]x ≥20
    270*(1.05^x)>47*x
    x^2-3x+2＞0
    x^2-2*abs（x）>0

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