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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (25+x)(80000-2000x) ≥25*80000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 25 + x ) * ( 80000 - 2000 * x ) ≥25 * 80000         (1)

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    From inequality(1)：
         0 ≤ x ≤ 15

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    The final solution set is :
         0 ≤ x ≤ 15

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