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

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

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    From inequality(1)：
         k ≤ -1/√2 或  k ≥ 1/√2
    From inequality(2)：
         -1 ≤ k ≤ 1

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    From inequalities (1) and (2)
         -1 ≤ k ≤ -1/√2 或  1/√2 ≤ k ≤ 1    (3)

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    The final solution set is :
         -1 ≤ k ≤ -1/√2 或  1/√2 ≤ k ≤ 1

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