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

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

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

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    From inequalities (1) and (2)
         x ≤ -1 或  0 ≤ x ≤ 0 或  x ≥ 1    (3)

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    The final solution set is :
         x ≤ -1 或  0 ≤ x ≤ 0 或  x ≥ 1

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