6-2x≥0 x-1/2-1<2x-4/3
    80n+120（20-n）≤2200
    80n+120（20-n）≤2200
    80n+120（20-n）≤2200
    x-lg(x)<0
    log(2,x)<0
    x-1<3
    34.2+2.85x-51.3+x<75.3
    2x^2-3√2x+1≥0
    2x^2-3x+1≥0
    2x^2-x+1≥0
    34.2+2.85x-51.3+x<75.3
    3x>3
    ((353.5 × 130)/(x²)) ≥ (3.05 + (0.024 × x))
    -30e^(x)-sinx+2<30
    -3.00001e^(x)-sinx+2<3.00001
    -3.001e^(x)-sinx+2<3.001
    -3.1e^(x)-sinx+2<3.1
    -3e^(x)-sinx+2<3
    3e^(x)-sinx+2<3

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