2/1-x＞1
    3x²－5x＋4＜0
    x²－3x＋4＞0
    x-4/x+6＜0
    (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

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