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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （21/2）a∧2-（9/2）a∧3 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 21 / 2 ) * a ^ 2 - ( 9 / 2 ) * a ^ 3 >0         (1)

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    From inequality(1)：
         a < 0 或  0 < a < 7/3

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    The final solution set is :
         a < 0 或  0 < a < 7/3

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