1-3/（x-1）≤2/（2x＋3）
    -2x<0
    0.3x^3-0.382x-5.81≥0
    9＜=(k+1)^2＜=27
    (k+1)^2＜=9
    x+1≤9 -114514x＜1919810
    -114514x＜1919810
    0.5-0.5m<4/5
    (2x+5)/3-1小于等于2-x
    x-1-2x-3<-2
    1/2(x+8)-2>0
    2x-1/4≤3x+2/2 -1
    2x-1/4≤3x+2/2 -1
    2x-1/4≤3x+2/2
    3x+3>3
    3x+3>3
    -0.002*X²+0.12*X+0.709＞0.91
    -0.003X²+0.143X+0.574＞0.91
    0.265x+0.719＞1
    0.383x+0.834＞1

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