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
    (3-x)/2>x
    3(x-1)<5x+1 (x+1)/2>=2x-4 x/2-x/3>-1 2?(X-3)-3(x-2)>-6
    x-3(x-2)>4 (2x-1)/5>=(x+1)/2-1 2x-5<3x (x-2)/2<=0 3-2(x-1)<3x
    6+2x<7+x 3x-2<-8 5x-17 3x-2<4 (2x+1)/3>=1

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