cosx <0.5
    x^x < 0
    xsinx>5
    x^2-x<=0 2*x-1>0
    0>0.15*(n-1)-5sqrt(0.03*(n-1))>-20
    0>15*(n-1)-5sqrt(3*(n-1))>-20
    15*(n-1)-5sqrt(3*(n-1))>-20
    1000x-10x²-21000≥3910
    -10x²-1000x-2100≥3910
    36-3x/2≥36/x
    30-3x/2≥36
    -10x×x+1400x≥46750
    -7t＾2+6t+1>0
    3+5X—2X²≤0
    （-x）²＜4
    3x^2+48x+160＞0
    2+3（x-1)<2(x+1)
    2x＜3x-1
    2*x - 3 < 1
    2*x^2-3*x-2<=0 x^2+5*x+6<0

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