（x+1）（x-5）（x-2）（x-5）<0
    a^2+16/9-8/3*a <20/9
    m+1<-m-1
    -3
    -3<-m-1
    -3<-m-1
    -3
    -3<-m-1<1
    -3<-m-1
    -m-1<1
    m+1<-m-1
    -3
    x^2>-x-6
    x^2>x+6
    x^2
    2x²-3x+4＜1
    x²-(2√5)x+√5＞0
    x^2+sqrt2x-2sqrt2<0
    3x+4>0
    4x^2+1>=0

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