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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 6000+（80-x）*（200-10x）-10*（400-10x） ≥9000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        6000 + ( 80 - x ) * ( 200 - 10 * x ) - 10 * ( 400 - 10 * x ) ≥9000         (1)

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    From inequality(1)：
         x ≤ 11.45898 或  x ≥ 78.54102

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    The final solution set is :
         x ≤ 11.45898 或  x ≥ 78.54102

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