0≤x-1/x+1≤1
    -x²+2x+3<3
    x－5/（x＋3）^2＞0
    （x＋7）／（8-2x）＞0
    x＋7/8－2x＞0
    -1/a<=1-sqrt(1+3/a)
    4-4×2m≥0
    839.6X^5.3-X^1.3-1≥0
    839.6X^5.3-X^0.3-1≥0
    839.6X^4.3-X^0.3-1≥0
    x^2-2x+3<0
    x^2-2x+1>0
    3x≥5-2x^2
    -3x^2+2x+1>0
    2x^2<4
    x^2+4x>0
    x^24x>0
    x^2+x-2≥0
    x^2-5x+6≤0
    x^2+x-6<0

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