x(x+1)＞3
    e-0.1t≥1/2
    3x∧2-x≥0
    2*x^3-3*x^2+1>0
    2x^3-3x^2+1>0
    2x^3-3x^2+1>0
    768*0.75^(n-1)<7
    x²-4x-5>0
    x-1/x-2>=1
    38<9x
    -3x^2+60x+80≥330
    352-17.7x≥330
    3x²-68x+115<0
    3^(1-x)≤3
    3^(x-1)≤3
    950+0.3x ≤ 2x
    (380+x*0.3/2.5)*2.5 ≥ 0.5x
    (380+x*0.3/2.5)*2.5 ≥ 2x
    950+（x*0.3/2.5）*2.5 ≥ 2x
    950+0.12x≤2x

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