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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 9 <= (k+1)^2 <= 27 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        9 <= ( k + 1 ) ^ 2         (1)
         ( k + 1 ) ^ 2 <= 27         (2)

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    From inequality(1)：
         k ≤ -4 或  k ≥ 2
    From inequality(2)：
         -6.196152 ≤ k ≤ 4.196152

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    From inequalities (1) and (2)
         -6.196152 ≤ k ≤ -4 或  2 ≤ k ≤ 4.196152    (3)

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    The final solution set is :
         -6.196152 ≤ k ≤ -4 或  2 ≤ k ≤ 4.196152

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