-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
    50一2a≥18 50一2a≤26
    (3×x2)×(3×x-5)>0
    280x十10x>950十3400
    -15000+X+X*2%>=4500
    x∧－2x－3＞0
    abs(k)-3＞0
    （1-k）（abs(k)-3）＜0

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