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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -13     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -13 < k * ( k + 2 )         (1)
         k * ( k + 2 ) < 0         (2)

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    From inequality(1)：
         k ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(2)：
         -2 < k < 0

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    From inequalities (1) and (2)
         -2 < k < 0     (3)

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    The final solution set is :
         -2 < k < 0

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