((1/240)(x+1000000))-x/280<=6000
    ((x+1000000)/240)-x/280<6000
    (x+1000000/240)-x/280<6000
    ((x+1000000)/240)-x/280<=6000
    ((x+1000000)/(280-40))-x/280<=6000
    3x^3+4x+1＞0
    (2+x)/2>=((2x-1)/3)-2
    (2+x)/2>=(2x-1)/3-2
    (x-3)/2>=(2x-5)/3
    (x+0.5)^2+2*x≥0
    x+2<6
    (4a+1)/6<-2
    (4a+1)/6>0
    (y+1)/6-(2y-5)/4>=1
    (5x+1)/6-2>(x-5)/4
    (2x-1)/3<=(3x-4)/6
    (x-3)/2<(2x-5)/3
    10-4(x-4)<=2(x-1)
    10(20-x)>90
    4.8x<=6

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