Mathematics
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    (x+20)(100-2x) >=2400
    x/(x^2+x+1)>=2/7
    x/(x^2+x+1)>=1/2
    sqrt(4*x-2)+2*sqrt(3-x)>2024/2023
    5x-1<3(x+1) (2x-1)/3-(5x+1)/2≤1
    (k-1)^2-8(k+3)≥0
    (k-1)^2-8(k+3)≥0
    3x²+14x+8 <0
    7551+240n÷6>12000
    350a+220(30-a)≤10000 100a+40(30-a)≥2660
    100a+150(10-a)≤1200 60a+100(10-a)≥680
    7551+400n>12000
    x+3≤5
    -5小于Xsqrt(3)小于5
    60a+100(200-a)小于等于15000
    60a+100(200-a)小于等于125
    -x²+4x-4<0
    32+32n>400
    38+43n>183+33n
    4/a>-1/2

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