600*(40000-3000*x)/4000+800*x <9050
    600*(40000-3000*x)/4000+800*x <9100
    600*(40000-3000*x)/4000+800*x <9200
    600*(40000-3000*x)/4000+800*x<9000
    600*(40000-3000*x)/4000+900*x<9300
    600*x+900*（40000-4000*x）/3000<9300
    n<=3(50-n)
    7.5*a^2-350*a+4030<=0
    ((x+5)/2)-1<(3x+2)/2
    (x-30)*43%<(x-48)*88%
    (3x-1)/(2-x)≥1
    (3x-1)*(2-x)≥1
    3x-1/2-x≥1 abs(3x+1)≥3*abs(x-3) (x-3)^2/(x+1)*(x+2)*(x-6) ≤0
    3x-1/2-x≥1
    x∧2－x－6＞0
    x2－x－6＞0
    26700+X*（1-10%/4）≥50000
    -5*t*t-4*t>0
    1-t*t>0
    a^2-18a-3＜4

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