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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality n*n+5n-20n >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         n * n + 5 * n - 20 * n >0         (1)

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    From inequality(1)：
         n < 0 或  n ＞ 15

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    The final solution set is :
         n < 0 或  n ＞ 15

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