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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20x <25x^2-21 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * x <25 * x ^ 2 - 21         (1)

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    From inequality(1)：
         x < -3/5 或  x ＞ 7/5

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    The final solution set is :
         x < -3/5 或  x ＞ 7/5

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