t*lnt<3*(t-1)
    18
    -36a^(2)+48a+112a≥0
    2x+3≥x+4 （2x+5）/3-2<2-x
    2x+3≥x+4 2x+5/3-2<2-x
    4x^2-12x+9=0
    k^2-8(1-2k)≥0
    -x^2+6x-10≥0
    -x^(2)＋6x-9>0
    (e(-0.607x)-e(-0.6677x))/(2.15108-e(-0.607x))<0.01
    (e(-0.427x)-e(-0.4697x))/(1.8171-e(-0.427x))<0.01
    (e(-0.557x)-e(-0.6127x))/(2.1328125-e(-0.557x))<0.01
    (e(-0.413x)-e(-0.4543x))/(1.8159-e(-0.413x))<0.01
    lnx>5.289259
    (e(-2.106x)-e(-2.3166x))/(4.5319+e(-2.106x))<0.01
    (1－x)+sqrt(x×x－2)<2
    1－x+sqrt(x×x－2)<2
    1－m+sqrt(m×m－2)<2
    1－m+√(m×m－2)<2
    (1-0.187e(-1.923x))/(1-0.187e(-2.1153x))>0.99

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