3.5*x^2+1.47*x-0.19644＞0
    x²-2x-3>0
    -4/a>-1
    -4/a<=-1
    x^2+x>=0
    ln(3x+4)>=0
    (3-x)/(2x+1)>=1
    x-3＜2x+5＜7
    x²+2x≤5040
    4x(x^2+2x+1)≥0
    1-((x-1)/(x+1))^2≥0
    (6+x)/(11+x)>60%
    4x^2-100 x+1200大于0
    abs(x-2)-abs(4-2x)<=-1
    abs(2x-3)<=x+1
    x/(x+1)<0
    abs(x/(x+1))>x/(x+1)
    x+1>2/x
    60/(x+20)+1+40/(x-20)<=5
    (x+2)/(x*x-5x-6)>=0

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