Mathematics
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    (3-x)/(2x+1)大于等于0
    [2(k-1)]^2-4*(k^2-1)>0
    (2x+1)/(x-1)>3
    (x-3)/(x+1)大于等于0
    x^2+2*x-3>0
    x^2-2*x-8<0
    4x^2-4x+1>0
    -x^2+2x-3<0
    5x>160 x<4
    5x>160
    X^2-6+2≤0
    5x>160 7x<21
    5x>160 7x<21
    5x>160 7x<21
    5x>16 7x<21
    5x>3 7x<21
    2/x+2≤3
    0.618^n<0.2
    x^(0.5)-lnx>0
    1/x≤3

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