600≥X-(X/300*40-140)-0.05X
    600≥X-(X/300*40-70)-0.05X
    0≥X^2+524.625X+4500
    0≥X
    1800+（30√2-20t）^(2)≤450
    9（a+1)^2-4(a^2-1) <0
    9（a+1)^2-4(a^2-1)<0
    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)

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