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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (2.5+0.1X)*(80000-2000X) >= 180000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 2.5 + 0.1 * X ) * ( 80000 - 2000 * X ) >= 180000         (1)

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    From inequality(1)：
         -5 ≤ X ≤ 20

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    The final solution set is :
         -5 ≤ X ≤ 20

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