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
    x/340-x/1500＜0.1
    x^2+2x+9大于0
    31.3＋C－C×6%×3/12≥50
    x^2-x-12<0
    3x≥2
    (3x-3)(2x+1)<=0
    (x-1)/x-2>1

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