（2x-3）*（x-1）<0
    （2x-3）*（x-1）＞0
    7n^2-43n-4670>0
    k*k-72k+900≥0
    k*k-132k+324≥0
    -43*30+7*30^2
    -43n+7n^2>4670
    sqrt132609
    -43n+7^2>4670
    9432+43.5x/(0.88-0.0018x)>30000
    1.8×x＝1.68×x
    ln3
    2^7
    sqrt9
    √9
    ln(3√x+1)
    3*m^2+2*m-9<0
     x(x+2)<0
     2(x+2)<0
     (x+2)<0

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