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
    x^12346<1
    x^x<4
    -4a²+4a+7＞-1
    2m＞-m+9
    2m+m＞9
    2m>-m+9
    1/3X+5/3-10/X<0
    -1＜2^x＜1
     log(1/2,2x+1)>-1
    2ax^2-ax-1>0
    （2x+1）（x-1）<0
    log(2,x）≥2
    x^2-x＞2

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