n+sqrt(n)-3750>0
    n+sqrt(n)-3750<0
    10990*x*x*x=6*x+16
    2x+1>x－5 4x≤3x+2
    ｛3x+1>x+3 2x－1
    3x+1>x+3 2x－1
    2x+1≤3
    {2x－1≥－1 2x+1≤3}
    {x+3≥6 ｛2x－1≤9
    c^(2)-72c+81≤0
    2(y+1)-3(2y-5)≥12
    3x^2+2x-1=0
    6x-3(x+2)>(2-x)
    1+2x>3（x-1）
    1+2x>x-1
    2(2x-1)≤3x-4
    x^2-x-3≤0
    -3(x-2)≥4-x
    3x-(x+2)<2
    3（x-1)≤x+1

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