（m-1)(m-2)<0
    (x^2-x-6)/(x-1)≥0
    (x^2-1)(x-1)(x^2-x-2)＜0
    (x^2-1)(x-1)(x^2-x-2)
    4-4（2m-1）≥0
    4-4（2m-1）
    （2m+1）（2m+1）-4（m*m-1）＞0
    （2k+1）（2k+1）-4（k*k+1）＞0
    0<=(40-2a)*(60-2a)<=800
    211
    1-3x<-7
    1-3x<-4
    x+1<-x+2
    x+1>x+2
    x^2-2x-3<0
    5-3x>-8
    27÷270＋X = 18÷150+X
    1000000-0.658316275833733*(1000000-(-36375.5151002927-(A/-92.6306)))<1000000
    x/0.1469=299661.5
    x/1.13*0.13=122887

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