n^2-12n+50>0
    n^2-2n+61>0
    3^(1/3)<(n+1)^(1/n)
    n^(n-1)<(n-1)^n
    n^(n-2)<(n-1)^(n-1)
    (40000-3000*x)/4000*600+800*x<9150
    600*(40000-3000*x)/4000+800*x <9150
    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

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