-2*x*x+3*x+4>0
    -x*x+2*x+1>0
    x*x+3*x-4>0
    4-x*x<0
    3*x*x-4<0
    3*x*x-2*x+1<0
    x*x-8x+16<0
    x*x-x-12<0
    3*x*x-x-4>0
    （2x-3）（x+1)>0
    abs(3x-4)>1+2x
    abs(2x+3)+abs(2x-2)≤8
    5>abs(2x-3)≥1
    abs(2x-3)≥1
    abs(2-x)≥3
    abs(x+2)<3
    abs(x-1)+abs(x-2)
    abs(x+1)>abs(2x-1)
    abs(4x-3)>2x+1
    0≥2x-1/x-2

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