x^2-0.248x+0.002860≤0
    x^2-1.00352x+0.006348≤0
    （x-2）+2（5-x）≥6
    （2-x）+2（5-x）≥6
    0.5k＞0
    1-y/2
    1-y/2
    （0.7-0.1k）/0.7＞0
    【-（2k+1）】^2-4k^2大于等于0
    （2－1.8）×（6000-x）＋（3-2.5）x≧1800
    （2－1.8）×（600-x）+（6000-x）×（3-2.5）x≧1800
    【-（2k+1）】^2-4k大于等于0
    12+150X<250X
    4x－2(25－x)≥60
    -1532750+A-A×0.025≥300000
    x^2≤0
    2/(x-1)≥0
    3(1-x)<2(x+9) (x-3)/5-(x+4)/2<=-7/5
    (-2)^2-4(m-2)≥0
    (3x-1)/2-(5-2x)/3<=(5x+3)/4-2

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