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

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

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    From inequality(1)：
         x ≥ -7/2
    From inequality(2)：
         x ≤ 5/2

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    From inequalities (1) and (2)
         -7/2 ≤ x ≤ 5/2    (3)

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    The final solution set is :
         -7/2 ≤ x ≤ 5/2

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