Mathematics
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    sqrt(x1)+x2<=2
    -2a^2+a+3>0
    (1+x)/(1-x)>1
    -3/x<-x+2
    0<xe2+3x+2
    -k-1/5≥1
    -5/k-1≥1
    2x^2×2x-1>0
    (x+1)÷(1-x)>3x+1
    (x+1)÷(1-x)>0
    (1/2)^x<2
    (1+x)^4 >1.004^12
    1<2^x<2
    0.5a^2<1
    49x²+9600x-36000>0
    1-2a^3-3a^2>0
    (20-x)/2*x≥42
    1+2a^3-3a^2>0
    1-2*lnx>0
    2^2n+n^2>1002

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