（8-x）<1
    x/2x-1小于1
    x∧2-3x+18＞0
    2xe^(x−1)+x^2*e^(x−1)−x^2−2x>0
    x-1＜2x-1/3
    48x(1-exp(-0.08x))<=80x-850
    48x(1-exp(-0.08x))<=80000x-850
    -5x≤5
    （x-1）[x-(23/3)]>0
    2x- x-1/2＜1
    x/5+1
    48x(1-exp(-0.08x))<=800x-850
    x>x-213 x<(x+1)^(x+2)
    （9-5x）1/2≥3x-1
    (√3x－1)－x＞0
    -3＜1-3x≤3
    x(x－1)－2x＜10
    (n-5)(n-4)(n-7)＜240
    (n-5)(n-4)(n-7)＜248
    (x-1)^9999-2^9999×x^9999≤x+1

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