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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (1+a)(1+2a)大于等于(5+a) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 1 + a ) * ( 1 + 2 * a ) ≥ ( 5 + a )         (1)

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

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

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