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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （5a＋2）（－4a＋2）（－3a＋2） <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 5 * a + 2 ) * ( -4 * a + 2 ) * ( -3 * a + 2 ) <0         (1)

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    From inequality(1)：
         a < -2/5 或  1/2 < a < 2/3

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    The final solution set is :
         a < -2/5 或  1/2 < a < 2/3

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