Mathematics
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    n(n+1)(2n+1)/6<385
    -18+22×e^(-10x)>0
    ((x^2)-x-5)^2-(2x-1)^2>0
    x≤9
    ax^2+ax+1≥0
    -2<sqrt(a^2-3a+2)-a<2
    sqrt(a^2-3a+2)+a>2
    0
    
x^2-3absx+2>0
    abs(2x-1)+abs(x-3)>=5
    abs(x-1)+abs(x-3)>2
    abs(x-1)+abs(x-3)<2
    5X-3X^2-2 >0
    X^-X-6 >0
    5X-3X^-2>0
    X*X<9
    X*X>6+X
    abs(x-1)+abs(x-3)<=3
    X*X-X-6>0
    abs(a+1)>abs(3-2a)

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