2/a>(-a+sqrt(a^2+9))2
    x^3+2x^2+16x>30
    12x>5
    (1+2k)/k>0
    2k+1>0
    （x+3）*（x^2-4）<0
    2+（x+1）（x-2）>8
    50(96-a)+80a<=5720
    v^2-89*v+1600≤0
    abs(x)<π
    x<√(xx)
    x>√(xx)
    2x<(x+1)
    x<(x+1)
    xcos(1)≥x
    x≥xx
    x>2x
    x/400-1.96(x*(1-x/400)/400/400)^(1/2)>0.2
    x/400>2
    x*x+2x-3 > 0

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