（3-m)^2-4(-2*(-5-2m))>0
    (4x-8)^2-16x≤0
    xx-2x+1>0
    x（2x-1）≥0
    2x-1/x≥0
    x^2≤2
    X-1≥0
    3-x≥0
    m²-12m+36≥0
    -4a>-4
    x²-25≤0
    x²-25≤0
    ax^2-2ax+4≤0
    ax²-2ax+4≤0
    1-1/x²<0
    1-1/x²>0
    X-213400-15000≧5000
    abs(2x-1)+abs(3x-1)+abs(x+1)<20
    abs(2x-1)+abs(3x-1)+abs(x+1)<20
    abs(2x^2-1)+x+1>2

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