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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2400×（200000－25000t）×（1－t） ≥9000000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2400 × ( 200000 - 25000 * t ) × ( 1 - t ) ≥9000000         (1)

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    From inequality(1)：
         t ≤ 0.978637 或  t ≥ 8.021363

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    The final solution set is :
         t ≤ 0.978637 或  t ≥ 8.021363

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