13-4X^2＞0
    13-4x^2＞13
    11－3x＜2
    m²-4m-12＜0
    8*(x^3)/(((x^2)-1)^3)-(6*x)/(((x^2)-1)^2)<0
    8*(x^3)/(((x^2)-1)^3)-(6*x)/(((x^2)-1)^2)>0
    (2x-1)lnx+x>0
    x^2+5x-elnx<0
    x²+x-6＜0
    (1+5^0.5)^x-(1-5^0.5)^x>2^2x
    0.8*1000m+0.6*750*(50-m）≥29500
    x＞3
    x^3+x≥1
    2cos(2x)-4sinx＜0
    6x（x-1）＞0
    1/(1+x^(1/2))<=lnx/sqrt(x)
    1/(1+x^(1/6))<=lnx/sqrt(x)
    1/(1+x^(1/8))<=lnx/sqrt(x)
    (e^(-0.5*x^(1/4)))/((1+x^(1/8))sqrt(3.14))<=lnx/sqrt(x)
    x+（x^2-8）^1/2＜0

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