abs（x）≤3
    a^（e/a）≥e
    a^（e/a）≤e
    4-4（2m-1）≥0
    -2＜1/x＜2
    x>x+1
    2x
    2x
    2x
    4x<-100x
    4x<2x-100
    4x<2x+100
    4x<2x
    2x<4x
    x<3;2x>4
    x<2
    x(1-x)>0
    5-2x>0
    2x-5>0
    0.01v^2-0.25v>9

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