x-2/x≤0
    5x^2+18x-23<0
    sqrt（2x-x^2）≥0
    x^2-2x≥0
    2x-x^2≥0
    -m-1／1-m*m>0
    -m-1／1-m*m<1
    -m+1／1-m*m<1
    -m+1／1-m*m>0
    3{2X+1}=<4{X-1
    (x-3)/(x+1)<0
    (x-1)/(x+1) ≥2 (x-1)/(x+1) ≥-2
    (x-1)/(x+1)≥2
    (-x)/(3+x)≤0
    (x-1)/(x+2)≤0
    (2x+3)/(2-x)≥1
    x^4+x^2<(x^2+1)*（-x^2+8)
    3t^2-30t=1
    （x+1）（x－1）^2（x－4）^3<0 x+1>2
    （x+1）（x－1）^2（x－4）^3<0 x+1>2

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