0≤0
    x-0.155x>=4000
    x-5.155x>=4000
    1/2+a+√(5+4a^2)/2<0
    1/2+a-√(5+4a^2)/2<0
    1/2+a-√(5+4a2)/2<0
    x^2≤2
    (x+3)(2-x)>0
    0
    X/X+1>=-1 X/X+1>0 X/X+1<=1 X/X+1<0
    X/X+1>=-1
    x^2-9<5x+3
    x^2+9<=5x-3
    x^2+9>5x-3
    3x^2*9>5x-3
    -2＜(x-√(8x-5))/(x+1)＜4
    xxxxxxxxxxxxxxxxxxxxxxxx＜0
    ex＞0
    √(-ex)＜10000000
    ln(-ex)＜10000

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