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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 6 <= 2a^3-2a <= 9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        6 <= 2 * a ^ 3 - 2 * a         (1)
         2 * a ^ 3 - 2 * a <= 9         (2)

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    From inequality(1)：
         a ≥ 1.6717
    From inequality(2)：
         a ≤ 1.85198

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    From inequalities (1) and (2)
         1.6717 ≤ a ≤ 1.85198    (3)

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    The final solution set is :
         1.6717 ≤ a ≤ 1.85198

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