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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -4     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -4 < x ^ 2 - 4 * x         (1)
         x ^ 2 - 4 * x <4         (2)

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    From inequality(1)：
         x < 2 或  x ＞ 2
    From inequality(2)：
         -0.828427 < x < 4.828427

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    From inequalities (1) and (2)
         -0.828427 < x < 2 或  2 < x < 4.828427     (3)

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    The final solution set is :
         -0.828427 < x < 2 或  2 < x < 4.828427

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