Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2x^-1+2x^-2+2x^-3 <= 1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * x ^ -1 + 2 * x ^ -2 + 2 * x ^ -3 <= 1         (1)

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    From inequality(1)：
         x ≤ 0 或  x ≥ 2.91964

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    The final solution set is :
         x ≤ 0 或  x ≥ 2.91964

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