510+129n＞1100-40n
    X2-2x+3<0
    x^2-2x+3<0
    X2-2x+3<0
    x^（x-1）<1
    x^（x-1）≥1
    abs（x）+x≤0
    2（3x－4）≥4-3x
    2x－2≥1-x/2
    2^7＞x
    3-x/x-1>2x-1/3-2x
    3-x/x-1<2x-1/3-2x
    -3x²+5x+6<0
    -3x2+5x+6<0
    2^x+7^x+x^2+x≥-125
    e^z-z^2-z>1
    e^z-z^2-z≤1
    e^z-z^2-z<1
    e^z-z^2-z≥1
    cosx>x^2

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