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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1 >x*x-4x >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1 > x * x - 4 * x         (1)
         x * x - 4 * x >0         (2)

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    From inequality(1)：
         -0.236068 < x < 4.236068
    From inequality(2)：
         x < 0 或  x ＞ 4

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    From inequalities (1) and (2)
         -0.236068 < x < 0 或  4 < x < 4.236068     (3)

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    The final solution set is :
         -0.236068 < x < 0 或  4 < x < 4.236068

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