2(a^2+1)>3a^2+1/3
    (18k)^2-4(k+1)(81k-9)>0
    a^2+4a+1<0
    x^2-4abs(x)+1<0
    4abs(a) >= 3a^2+1/3
    3a^2+1/3>=a^2+1
    2(3a^2+1/3)>a^2+1
    5<-7/2k<=6 -4<=-7/2k<-3
    (a+3)/(5-a)>=1
    abs(2x+1)>5
    5sinx>2cos2x-4
    2/2x+1>1/21
    （2x-1）/3-(5x+1)/2<=1
    m2-6m+1≥0
    ((2k+1)^2)-4((k-1)^2)≥0
    2t-1<-t
    -1<=2t-1<=1
    x≤2
    2.3x-8.98<0
    log(x,27)<3

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