4x²-13x<0
    x^2-3x+2
    20x+30（8-x）≥210 （90-20）x+（130-30）（8-x）≤770
    x^2-4x-5＜0
    2^x+1＞1
    ln(x + 5)^x < 6
    ln(x + 5) / ln(x) < 1
    ln(x + 5) / x < 0
    ln(x + 2) / x < 0
    ln(x + 1) / x < 0
    lnx / x < 0
    e^x / x > 5
    xlnx<1
    x^-x > 0.1
    x^-x > 1.2
    x^x > 1.2
    x^x > 1
    x^x > 0.1
    cosx < 0
    cosx > 1

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