Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 60t-1.5t^2 >216 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        60 * t - 1.5 * t ^ 2 >216         (1)

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    From inequality(1)：
         4 < t < 36

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    The final solution set is :
         4 < t < 36
[ 2/2Inequality]
    Assignment:Find the solution set of inequality t <= -60/(2*(-1.5)) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         t <= -60 / ( 2 * ( -1.5 ) )         (1)

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    From inequality(1)：
         t ≤ 20

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    The final solution set is :
         t ≤ 20

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