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

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

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

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

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