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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        0 < t ^ 2 + 2 * t         (1)
         t ^ 2 + 2 * t <1         (2)

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    From inequality(1)：
         t < -2 或  t ＞ 0
    From inequality(2)：
         -2.414214 < t < 0.414214

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    From inequalities (1) and (2)
         -2.414214 < t < -2 或  0 < t < 0.414214     (3)

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    The final solution set is :
         -2.414214 < t < -2 或  0 < t < 0.414214

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