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
    2^(（x^2）+x)<(1/4)^(x-2)
    （100－x）（1+1.2x%）≥100
    3x+1/3-x>-1
    3x+1/3-x>-1
    (x-2)/(x-1)>=2
    2>(3/x)
    ex+e-x＜2/x
    3x²+14x+8<0
    (x²+1)(x²-4)＜0
    1-4k≥0
    60x+24（100-x）≥3120
    abs((1+x+sqrt((1+x)^2-4x))/2)<1
    abs(x)>3

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