Mathematics
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    1-2/(k+1/k)>0
    x^2-7x+10≥0 x^2-9x+12≥0
    25-5*a-10+5+a≥0
    7X+4(10-X)小于等于55
    (2+x)/(3-x)>1
    (2x+1)/(x-2)≥1
    1/x>4
    -2
    
-2x²+x+3<0
    3x²-2x+1>0
    (x+1)(2x-1)>0
    (x+2)(5-x)>0
    -x²+6x-10>0
    4x²+4x+1>0
    -3x²+6x≤2
    8-x/5+x≥1
    2x-1/3+x≤2
    x+1/2+x>1
    (2x-3)/(3x-4)<=2
    x^2+2x+3>0

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