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

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

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    From inequality(1)：
         a ≤ 0 或  1 ≤ a ≤ 3

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    The final solution set is :
         a ≤ 0 或  1 ≤ a ≤ 3

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