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

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

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    From inequality(1)：
         x ≤ -3 或  x ≥ 0
    From inequality(2)：
         -1/3 ≤ x ≤ 0

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    From inequalities (1) and (2)
         0 ≤ x ≤ 0    (3)

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    The final solution set is :
         0 ≤ x ≤ 0

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