e^=-0.15
    1103.72×10^6≤13.8×2000x(1450-x/2)
    2594.54×10^6≤13.8×2000x(1450-x/2)
    1422.58×10^6≤13.8×2000x(1450-x/2)
    (2000-50n)/2.5n>=1.65
    (2000-50n)/√2.5n>=1.65
    4333.74×10^6≤13.8×2000x(1450-x/2)
    3856.02×10^6≤13.8×1500x*(1150-x/2)
    3856.02×10^6≤13.8×1500x(1150-x/2)
    -1-sqrt(1-8x)≤2
    -sqrt(3)≤3
    sqrt(1-8x)≥7
    -sqrt(1-8x)≤3
    (2000-50n)/√（6.25n）>=1.65
    (2000-50n)/√6.25n>=1.65
    3a+6≥a+30
    2x+13−8x>−x−7
    (x+5/x)/2≥√5
    (x+5/x)/2≥1
    (x+1/x)/2≥1

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