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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality k^3+3*k^2-6*k+1 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         k ^ 3 + 3 * k ^ 2 - 6 * k + 1 <0         (1)

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    From inequality(1)：
         k < -4.411474 或  0.184793 < k < 1.226682

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    The final solution set is :
         k < -4.411474 或  0.184793 < k < 1.226682

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