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
     (x^2+1)/2≥1
     x^2+1/2≥1
    40a+27(50-a)<=1500
    0.75*200x＜0.8*200(x-1)
    1.5*(20-x)+1.2(30+1.5x)≤69
    1.5*(20-x)+(30+1.5x)≤69
    1.5*(20-x)+(30+1.5x)≤69

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