0≤(1-√1-4a)/2a≤2
    x²＋4x－32＞0
    80x+40(100-x)≥6000 80x+40(100-x)≤6120
    t^3-2t^2+3t≥0.875
    t^3-3t^2+3t≥0.875
    1<5-x<3
    1<5-x<3
    90a+60(600-a)≤43200 2a≥600-a
    90a+60(60-a)≤43200 2a≥600-a
    3∧（x+1）-2x＜1173
    -2-3X＞1
    3/4x-1≥1
    x^2>4
    (8-k)²<(15-k)²
    8-k>15-k
    8-k<15-k
    -50-（100+X）*1%+X≥10
     -1082750+X-X*10%/4-450000大于等于300000
     -1082750+X-X*10%/4-450000大于等于300000
    -1082750+X-X*10%/4-450000大于等于300000

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