4x≥6
    -x^2-x+（√5-1）/2＜0
    2x-3>-x
    2x−3>−x
    2(2−x)≥3
    2(2−x)≥3
    60000/(3.14*d^2)+6*32000/(3.14*d^3)<35000000
    （2x+1）*（x+3）<0
    （2x+1）*（x+3）<0
    x^2-x+1>1
    （k-2)^2＞0
    (x+5)/2-1<(3x+2)/3 2(x+2)<=x+3 x/3<(x+1)/4 5x+2>=3(x-1) 1-(2x+5)/3>x-2
    1.5x+2(15-x)>26 1.5x+2(15-x)<27
    2-x>=0 2x>x-1
    3x-6<=9
    x/2-1<=7-3x/2 5x+2>3(x-1)
    x/2-1<=7-3x/2 5x+2>3(x+1)
    5-2x>=1
    1-2x<3 (x+1)/2<=2
    2a-6<0 1-a<0

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