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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality √9+9k^2+√1+k^2 ≤5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         √ 9 + 9 * k ^ 2 + √ 1 + k ^ 2 ≤5         (1)

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    From inequality(1)：
         -1/√10 ≤ k ≤ 1/√10

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    The final solution set is :
         -1/√10 ≤ k ≤ 1/√10

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