Mathematics
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    abs(a(2a^2+9a+1)/6)<-7
    abs(a(2a^2+9a+1)/6)≥1
    abs(a(2a^2+9a+1)/6)≥-1
    abs(a(2a^2+9a+1)/6)≥4
    1≤abs(a(2a^2+9a+1)/6)≤5
    (0.447+0.5x)/(x+1)>0.45
    (2510+x)/(2510+x+3105)>0.45
    (2519+x)/(2519+3101+x)>0.45
    (2515+x)/(2515+3101+x)>0.45
    ln(x+1)
    
ln(x+1)
    
(2510+x)/(2510+3100+x)>0.45
    4x^3 -9x +2>0
    x÷(x*0.2+3500)≥3.3
    x^2-x>0
    28x x 23(5000-x)小于等于15000
    -1<1+x<1 -1<1-x^2<1 1+x
    
(x+2.01)*(x+2.01) >4*[(x/2)*(x/2)+2.39*2.39]
    (x+2.66)*(x+2.66)>4*[(x/2)*(x/2)+2.39*2.39]
    2500m+3000(30-m)≤80000

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