-x^2-2x+3≥0
    x^2-7x+12＞0
    10x十14（100一x）≥1160 10x十14（100一x）≤1168
    -15000+X-X×8%/4≥4500
    8x/(x^2+4)>x
    x+7/x+2≥0
    x+7/x+2≥2
    -x^2+x+6>=0
    x+1>0
    5-x>0
    2x^2-5x+1＞0
    2x2-5x+1＞0
    16x^2-20x+23>0
    (x^2)-7x+10<0
    (x^2)-5x+6>0
    5*(x^2)-7<13
    log(2,(1+x))≤log(2,3)
    log(2,(1+x))≥log(2,3)
    x^2-13x-12<=0
    x2-13x-12<=0

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