(-4x^2+100x+1200)/(x^2-400)<0
    x^2-5*X<0
    lnx＜x^1/2
    lnx＜x^1/2
    (x－3)^2>(2x－1)^2
    4(k－1)+2(k+3)>0 (k－1)^2－4(k－3)>0
    (k－3)^2－4(k－1)≤0
    (k－3/k－1)^2－4/k－1≤ 0
    (k－3/k－1)^2－4/k－1<0
    3x+3≥4x+12
    (x-5)(x-2)>=0
    (x-5)(x-2)=>0
    (x-5)(x-2)>0
    lnx≤1-x
    -x^2+x+6>0
    X^2-4x小于0
    X-x^2小于0
    x(x+2)＞x(3-x)+1
    x²+6x+10＞0
    x²-14x+45≤0

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