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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3t^2+15t-320 ≤0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        3 * t ^ 2 + 15 * t - 320 ≤0         (1)

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    From inequality(1)：
         -13.126225 ≤ t ≤ 8.126225

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    The final solution set is :
         -13.126225 ≤ t ≤ 8.126225

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