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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality k^2-40k+120 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         k ^ 2 - 40 * k + 120 <0         (1)

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    From inequality(1)：
         3.266799 < k < 36.733201

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    The final solution set is :
         3.266799 < k < 36.733201

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