x/2≥e^(x-2)
    2^(x-1)
    a>1 a<0
    a>1
    -x＞1
    ax＞1
    ax＞1
    3x×（x+1）≦0
    （3-2x）×（3x-2）＞0
    x+1/3x-2＞1
    （x+1）×（x-5）×（x-1）＞0
    （x-3）×（5+x）×（x-1）＜0
    （x+3）×（1+x）×（x+2）＜0
    （x+3）×（1+x）×（x+2）＞0
    （x-3）×（1-x）×（x-2）＞0
    （3-x）×（x+5）＜0
    -x^2+x+2≧0
    -7x^2-5x-1＞0
    -x^2+4x-4＜0
    -4x^2+4x-1＜0

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