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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 600*(40000-3000*x)/4000+800*x <9000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        600 * ( 40000 - 3000 * x ) / 4000 + 800 * x <9000         (1)

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    From inequality(1)：
         x < 60/7

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    The final solution set is :
         x < 60/7

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