2^x-2^（-x）＜2^（-1/2）
    2^x-2^-x＜2^-1/2
    80+log（0.8，x-16）<=68
    R^2*(2-4R)＜0
    R^2*(2-4R)＞0
    9a>5
    2^x>15
    2^x>1
    arcsin(2x-1)≥0
    （x+2）(x-3)≥0
    x+2≥0
    x²-x-6≥0
    x²-x-6≥0
    80+log（0.8，x-16）<=68
    80+log（0.8，x-16）<=68
    （x+12）^2+84<=68
    （x-12）^2+84<=68
    abs((4x+1)/(x^2-x+1))<3
    0<(4x^2+1)/(x^2-x+1)<3
    abs((4x^2+1)/(x^2-x+1))<3

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