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

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

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

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

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    The final solution set is :
         0 ≤ x ≤ 2

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