(1/sqrt(0.01x-1))-1<=0.1
    4x^2+8x-8>=4x+3
    (x-8)(x+2)(x-3)≥0
    (x-1)(3x-4)≥0
    (x-4)(x+1)≥0
    (x-4)*(x+3)<0
    -a/2>2
    -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

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