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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (-4-4a)*(a^2+2a) <= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( -4 - 4 * a ) * ( a ^ 2 + 2 * a ) <= 0         (1)

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

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    The final solution set is :
         -2 ≤ a ≤ -1 或  a ≥ 0

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