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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （x+1）（x-5）（x-2）（x-5） <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( x + 1 ) * ( x - 5 ) * ( x - 2 ) * ( x - 5 ) <0         (1)

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    From inequality(1)：
         -1 < x < 2

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    The final solution set is :
         -1 < x < 2

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