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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -2x*x+60x+2000 ≥2400 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -2 * x * x + 60 * x + 2000 ≥2400         (1)

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    From inequality(1)：
         10 ≤ x ≤ 20

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    The final solution set is :
         10 ≤ x ≤ 20

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