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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (60-x-40)(300+40x) ≥6240 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 60 - x - 40 ) * ( 300 + 40 * x ) ≥6240         (1)

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    From inequality(1)：
         1/2 ≤ x ≤ 12

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    The final solution set is :
         1/2 ≤ x ≤ 12

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