（-9）*x^4+4*x^3+7*x^2-2x>0
    -n^2+14n-24>0
    3a^2+11a+3>0
    5X*0.7*0.8-0.15*5X-5＞2.4
    3.5X*0.7*0.8-0.15*3.5X-3.5＞2.4
    n>= (log(2,n))^2
    n<= (log(2,n))^2
    log（2，n^2）<=4*n^1/2
    log（2，n^2）<4*n^1/2
    log（2，n^2）<3*n^1/2
    log（2，n^2）<2*n^1/2
    log（2，n^2）
    x^2-5x-6>0
    4x^2-4x-15>0
    -2x^2+12x-18>=0
    6+x-2x^2<1
    6+x+2x^2<1
    -3x^2+5x-4>0
    4x^2-13<0
    -2x^2+30x-110≥0

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