3d+3<=-1 5d+2>=12
    (11/4)+(1/4)k>=-3
    3>(11/4)+(1/4)k
    -0.3x小于1.5
    -3x小于1.5
    -1<1-x
    -2a>1
    -2a>-1
    X>(5000-X)*0.8
    X>(5000-X)*80%
    X>(5000-X)*90%
    2a>-1
    2*a*a+1/2*a-1≥0
    2a2+1/2a-1≥0
    (x+0.05)(2x+0.5)<2
    x-1+sqrt(-x/2+1)>1
    x-1-sqrt(-x/2+1)<1
    x-2-(2-x)/2>(x-2)/3
    17+(2k-2)>=2(k+3）
    (2+x)/2>=(2x+1）/3

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