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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -3 ≤1/2x ≤0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -3 ≤1 / 2 * x         (1)
        1 / 2 * x ≤0         (2)

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    From inequality(1)：
         x ≥ -6
    From inequality(2)：
         x ≤ 0

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    From inequalities (1) and (2)
         -6 ≤ x ≤ 0    (3)

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    The final solution set is :
         -6 ≤ x ≤ 0

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