5(x-2)-1<=4(1+x)
    x+1<=2
    4x+2/3小于x/5-8+2
    40+x≥4/3（20+x）
    5+2(x-1)>-1 ((6-5x)/2)>-x-3
    5(x-1)<-x+1 ((x+1)/3)-((3x+1)/2)<1
    3x>4x-6 ((x-2)/2)>((x+1)/5)
    800*(15-x)/2<=1000x
    1000x+800(15-x)/2+500(15-x)/2 <= 12000
    1000x+800(15-x)/2+500(15-x)/2<= 1200
    X-4X<-1-2
    1000x+800(15-x)+500(15-x)<=12000
    800(15-x)<=1000x
    1000x+800(15-x)+500(15-x)<=12000
    x/4-1＜-x-3/3
    -4(7+4x)-3≥2-(6+2x)
    －(6-2x/5)≥3/2
    4-3x<3x+10 x+4>3x
    1.2*228.38*(2.24+t)<101.16*(0.75+t)+0.5*77.86t^2+0.5*317.8/9.66*t^3/3
    3x-0.5<1

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