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

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

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    From inequality(1)：
         a ≤ -3 或  a ≥ 1

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    The final solution set is :
         a ≤ -3 或  a ≥ 1

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