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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -1 ≤x²-x-1 ≤1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -1 ≤ x ^ 2 - x - 1         (1)
         x ^ 2 - x - 1 ≤1         (2)

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    From inequality(1)：
         x ≤ 0 或  x ≥ 1
    From inequality(2)：
         -1 ≤ x ≤ 2

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    From inequalities (1) and (2)
         -1 ≤ x ≤ 0 或  1 ≤ x ≤ 2    (3)

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    The final solution set is :
         -1 ≤ x ≤ 0 或  1 ≤ x ≤ 2

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