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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x^3-7x+7 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ^ 3 - 7 * x + 7 >0         (1)

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    From inequality(1)：
         -3.048917 < x < 1.356896 或  x ＞ 1.692021

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    The final solution set is :
         -3.048917 < x < 1.356896 或  x ＞ 1.692021

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