6x^> 11x + 35
     6x2 > 11x + 35
    x(x + 6) ≥ 40
    -4082750+300000-450000+X-X*10%/4≥300000
    3x＜x＋5/x
    2749536x∧2＋6023721600x＋903558240000≥0
    16<10+1.2(a-5)<17.2
    2*x^2-4*x+1≦0
    （k+1）（k-2)≥0
    -13000-x-0.12x/12≥5000
    55*（40-x)+70x<2400
    22x^2-8x-72<0
    22x2-8x-72<0
    (x+1)/3
    (2-x)/2>(2x-4)/3
    (lnx)/0.09+1/x>13.0343
    n^2-31n>0
    1.1×2240.55×10^6≤13.8×2200×x(1528-x/2)
    1.1×2240.55≤13.8×2200×x(1528-x/2)
    x/2+1>0

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