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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality c^(2)-72c+81 ≤0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         c ^ ( 2 ) - 72 * c + 81 ≤0         (1)

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    From inequality(1)：
         1.14315 ≤ c ≤ 70.85685

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    The final solution set is :
         1.14315 ≤ c ≤ 70.85685

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