3-3X^2 <0
    3-3X^2>0
    log(2,3-x)≦3
    abs(2x+3>13
    15-absx>5
    abs(1/2x-3)>=1
    （2-3x）^2<=1
    -x^2+5x+6>=0
    -3x^2-20x+7<=0
    5-8x<4x-1
    1-1/x<=-2<=1+1/x
    x+1≥-x^2+2x+3
    x+1≤-x^2+2x+3
    （1+5.17x^2-2.18x+0.24）*（1+x）*8546*54155*30/2214.5＞833
    （1+5.17x^2-2.18x+0.24）*（1+x）*10500*47486*30/1755＞833
    （1+5.17x^2-2.18x+0.24）*（1+x）*10500*47486＞833
    （5x-1）/4-1≤（2x+1）/3
    （5x-1）/4≤（2x+1）/3
    0.8*120（40-x)+90*1.1x<3880
     -200x^2+8800x-87000+200x-5800 ≥7200 800（x-16）≥7200

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