-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
    i^2≥-1
    i^2<-1
    （2x²-x+4）÷4≥（x²-2+4x）÷x
    x（2x-20）≤48
    x（20-2x）≥48
     x * ( 20 - 2 * x ) ≥48
    x（20-2x）≥48

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