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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -2 ≤t^(2)-3t ≤7 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -2 ≤ t ^ ( 2 ) - 3 * t         (1)
         t ^ ( 2 ) - 3 * t ≤7         (2)

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    From inequality(1)：
         t ≤ 1 或  t ≥ 2
    From inequality(2)：
         -1.541381 ≤ t ≤ 4.541381

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    From inequalities (1) and (2)
         -1.541381 ≤ t ≤ 1 或  2 ≤ t ≤ 4.541381    (3)

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    The final solution set is :
         -1.541381 ≤ t ≤ 1 或  2 ≤ t ≤ 4.541381

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