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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (40-x)(20+2x) ≥1200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 40 - x ) * ( 20 + 2 * x ) ≥1200         (1)

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    From inequality(1)：
         10 ≤ x ≤ 20

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    The final solution set is :
         10 ≤ x ≤ 20

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