ln（2a）≥2a－1
    ln2a≥2a－1
    -2<=7/2(1+3x)
    6(3/2x-1)>x-3
    4x+1>x-2
    m^2+4m<0
    m^2+2m+24<0
    4
    (15.925x^2+5.635x^3)/((72.945+48.63x+8.105x^2)+(7.27+1.818x)*(9+6x+x^2)>1.2
    2%*x/(x+2%*x)>1.25%
    2.4/(x+2.4)>1.25%
    2/(x+2)>1.25%
    2/(x+2)<1.25%
    2%/(x+2%)<1.25%
    5x+4<3（x+1）
    4x-1<2x-3
    x+8>4x+2
    －(2x+1)<3
    2x+1<3
    x^(2)－x－6<0

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