ln(x+sqrt(x^2+1))＜x
    ln(x+sqrt(x^2+1))＜0
    ln(x+sqrt(x^2+1))≥0
    sin(x)≥0
    asin(x)≥0
    x^(1/3)≥-1
    x^(1/3)≥1
    x≥x^3
    1/x≥1
    sin(x)＜x
    x^2≥x
    x/2≥x-1/3
    4x<3x+1
    241x-50*6.8/x>100x
     sqrt（x^2+8）≤ 2-x
    sqrt（x^2+8）≥2-x
    0.99x^3-x^2+3.97<0
    13－4X×X＞0
    （15+X）（30-2X）＞400
    150x+200(2x-10)≤9000

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