Mathematics
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    (25+x)(800-x/3×20)≥20000
    13m^2/25<1
    m^2/576+81m^2/256<0
    5x²-x-6>0
    -2e^2
    
2a<1+2a+a^2
     1+a^2>0
    1-a^2<2a
    1-a^2<2a 1+a^2>0
    x^2>0
    x^3>0
    0
    
1/k+1-0.9^k<1
    25x+18(100-x)<=2000
    -2x²+x+1<0
    (x+4)(x-3)^2>=0
    x^2-3x+2/x^2-2x-3≤0
    x-3/2x>0
    x((60-12x)/25)>72/25
    2x*x-5x-3>0

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