-a/2>0
    2sinπx/2-1≥0
     (600 * 2 + 50 * n) / ( n + 2) ≤ 90
     (600 * 2 + 50 * n) / ( n + 2) ≤ 60
     (600 * 3 + 50 * n) / ( n + 3) ≤ 60
    15-9x<10-4x
    5x+6>4x
    2x/5-1≤-3
    3x-5>-2x+10
    x2-4x+3＞0
    x^2－3x+1≥0
    x^2+3x+1≥0
    x^－3x+1≥0
    x^－x+1≥0
    2k－1＞0
    x∧2－2x－4＞4
    3x/x*x-1<=1
    2x+5/(x^2+2x-35)≥ 0
    2x+5/x^2+2x-35≥ 0
    x^2(21 − 20x) ≤ 1

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