-1.5<-1-x<1.5
    0.2-q>-0.1
    0.2-q>0.1
    3c-4>-4
    3c-4>4
    1/2x＜（2/x）-1
    1/2x＜2/x：-1
    1/2x＜2-x/x
    1/2x＜(2/x)-1
    1/2x＜2/x-1
    n+3/n＜12/n
    -X ² -3X+4≥0
    -x*x-8x-15>0
    x*x+2x-3>0
    (60－50)×a+(60×0.9－50)×(40－a)+(70－60)×40≥680
    600x+1000(200-x)<=180000
    x^2-3x+1>0
    x*(x+1)/2<=2*x+1
    x*(x-1)/2<=x
    x*x-3*x-2<=0

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