X+2>2X-3
    5X-1>3X+7
    X+2>2X-3
    2x-3（x-1）>2
    abs（2x^2-1）<1
    abs（2x^2-1）≤1
    abs（2x^2-1）<1
    -1
    -9
    -6
    x^4<-7
    x^2>1
    x^2>-1
    x^2+x+1≥1
    x^2+x+1≥-1
    x^2+x+1≥0
    x-1/x+4小于等于0
    5x＜8+2(x-1)
    x+3≥0
    0<1-2a<1

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