-k^2+3k+10>0
    4X-5>X+1
    （x-1)*(x-2) >2
    （x-1)*(x-2) >1
    （x-1)*(x-2)>2
    x/3＞1-(x/9)
    ex-x＞0
    x/x-2≥-1
    500-400≥400×10％
    -2*a+8-4*a^2>0
    4.2x+8.4>=20
    m^2-6m＋8＞0
    a^2+4a>=8
    (x^2+2)/(sqrt(x^2+1))>=2
    15<=2-3a<16
    x+15/2>x-3
    17<=2-3x<=18
    16<=2-3x<=-14/3
    3x<2-x<=x+4
    2-x<=x+4

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