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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality n^2-20n-4 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         n ^ 2 - 20 * n - 4 >0         (1)

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    From inequality(1)：
         n < -0.198039 或  n ＞ 20.198039

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    The final solution set is :
         n < -0.198039 或  n ＞ 20.198039

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