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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 391a^2-4940a-511500 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        391 * a ^ 2 - 4940 * a - 511500 <0         (1)

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    From inequality(1)：
         -30.399214 < a < 43.033485

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    The final solution set is :
         -30.399214 < a < 43.033485

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