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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality a^2-4a（a-1） <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a ^ 2 - 4 * a * ( a - 1 ) <0         (1)

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    From inequality(1)：
         a < 0 或  a ＞ 4/3

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    The final solution set is :
         a < 0 或  a ＞ 4/3

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