Mathematics
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    (2k+3)^2-4k(k+1)>0
    (2k+3)^2>0
    -2x²+72x+320≧870
    5x^2-6x-2≥0
    x²-14x+45≤0
    x^2>16
    x^2>9
    x^3≥0
    x^2≥0
    x^2>0
    x^4+4x+3>0
    2+x>x^2
    x²-7x-30<0
    (5x+5435)/(1139+x)>4.8
    abs(0.1354x^2-0.271x-0.8646)>abs(0.368x-0.368)*(1.368x-2.368)-1.736+1.104x
    abs(0.1354x^2-0.271x-0.8646)
    
abs(0.368x-0.368)<1
    0≤x²≤1
    e^x≤0.2
    100-x<160-2x

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