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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 7x-49 <-20x^2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        7 * x - 49 < -20 * x ^ 2         (1)

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    From inequality(1)：
         -7/4 < x < 7/5

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    The final solution set is :
         -7/4 < x < 7/5

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