-1/3≤1/x≤3
    x（x-1）>0
    x≥1/7
    x≥7/1
    x×½（20-x）≥42
    x+2>=0
    -1<=2-x<=1
    4+x>=0
    x-1>0
    -1<=1-x<=1
    （1.24×X1)/X2>5.19
    lg(1/x)>5
    1-x>0
    lg(1/x)>5
    lg(1/x)>5
    20lg(1/x)>100
    20lg(5/x)>100
    lg(5/x)>5
    -x²+4x＜5
    x²-2x+1＞0

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