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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 31x <20x^2-9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        31 * x <20 * x ^ 2 - 9         (1)

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    From inequality(1)：
         x < -1/4 或  x ＞ 9/5

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    The final solution set is :
         x < -1/4 或  x ＞ 9/5

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