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

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

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    From inequality(1)：
         -1.44949 < x < -1 或  3 < x < 3.44949

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    The final solution set is :
         -1.44949 < x < -1 或  3 < x < 3.44949

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