ln（2x+6）＞0
    2x+6＞0
    2^x+x＞1
    2(x^2+5/2x)-3<0
    2(x^2+2/5x)-3<0
    2x^2+5x-3<0
    -1＜1-a＜1
    -1＜2a-1＜1
    -1＜2a-1＜1-a＜1
    （5000-50x）>10x^1/2
    （1+1/x）^ln（1+1/x）<2
    2^x>15
    10000/(X+12.36)+10000/(X+20.6)≤150
    10000/(X+12.36)+10000/(X+20.6)≤150
    10000/(X+12.36)+10000/(X+20.6)≤150
    10000/(X+10.3)+10000/(X+20.6)≤150
    10000/X+10000/(X+20.6)≤150
    [-2(a-1)]^2-4(a^2-a-2)＞0
    [-2(a-1)]^2-4(a^2-a-2)＞0
    80+log（0.8，x-16）<=68

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