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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 8000 <= 1400x-10x*x-40000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        8000 <= 1400 * x - 10 * x * x - 40000         (1)

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    From inequality(1)：
         60 ≤ x ≤ 80

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    The final solution set is :
         60 ≤ x ≤ 80

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