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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (40-(100-x))(20+2(100-x)) ≥1200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 40 - ( 100 - x ) ) * ( 20 + 2 * ( 100 - x ) ) ≥1200         (1)

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    From inequality(1)：
         80 ≤ x ≤ 90

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    The final solution set is :
         80 ≤ x ≤ 90

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