Mathematics
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    5X^2+6X+1<0
    X^2+X+1<0
    (7-2a)(270+60a)≧1650
    (7-2a)(270-60a)≧1650
     -15000 + X - ( X * 2 % ) ≥4500
    log(a,2a)≤0.75
    x+1<x
    x+1>x
    (50+x)(600-5x)≥33000
    3/(x-2>-1
    3/x-2>-1
    3/x-1>-1
    q^9+8≥9q
    q^9+8≥9*q
    (1-x)^5(2x+1)^2(x+4)^3>=0
    x^2—3x—10<0
    lgx≤2
    2-lgx≥0
    1≤2X-1<9
    3x-3/x

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