(x^2-5/2)^2<0
    (-3x^2-4x-3)/(x+1)^2>-2.75
    13*x+54=838-x
    x+（13*x+54）=838
    abs(x)=2
    2e2-4e+7<7
    2x2-4x+7<7
    (n^3-1)/(n-n^3)<2-1/n
    1/2(n+1/n)<2-1/n
    n/2+1/2n<2-1/n
    x^2+3x-10>0
    x^2+x-6＜0
    x*2+x-6＜0
    x2+x-6＜0
    -20x^2+100x+6000≥6000
    abs（3/2x+2）≥5
    abs（2/3x+2）≥5
    36*a^3+60*a^2+29*a+8>0
    (x+3)(x-6)
    (x+3)(x+6)

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