（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
    7+2x>=6+3x
    (2x+1)/3-(1-2x)/2<1
    2x+2-3-6x<6
    3>2m+3
    2d^2+47d+210<0
    x^2-3x-10≤0
    x^2-2x+3<0

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