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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 324t^2-4(2t-9)(90t-t^2) ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        324 * t ^ 2 - 4 * ( 2 * t - 9 ) * ( 90 * t - t ^ 2 ) ≥0         (1)

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    From inequality(1)：
         0 ≤ t ≤ 9 或  t ≥ 45

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    The final solution set is :
         0 ≤ t ≤ 9 或  t ≥ 45

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