-x^2-2x+15
    x+4/x-3>0
    -x^2+4x-4>0
    x^2-4x+5小于0
    -2x^2+6x-5小于0
    3x^2-7x>10
    arccos(v)-v*sqrt(1-v^2)>0.628
    2(1+3x)<3
    arccos(v)-v*sqrt(1-v^2)>0.2*π
    arccos(v)-v*sqrt(1-v^2)>0.4
    c^2-8/c≥0
    m^2<3
    10x^(2)-33x+20小于0
    x^(2)+6x+9大于0
    2x^(2)+x小于0
    -x^(2)+x大于等于3x+1
    （2-X）/（4+X）<0
    （X-4）/（X+3）>0
    （X-4）/（X+3）<0
    （5-X）（3-X）<0

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