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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3.5*d^3-6d-19.2 >= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        3.5 * d ^ 3 - 6 * d - 19.2 >= 0         (1)

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    From inequality(1)：
         d ≥ 2.08465

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    The final solution set is :
         d ≥ 2.08465

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