Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality x²-1 ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ^ 2 - 1 ≥0         (1)

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

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    The final solution set is :
         x ≤ -1 或  x ≥ 1
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 1-x² ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 - x ^ 2 ≥0         (1)

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    From inequality(1)：
         -1 ≤ x ≤ 1

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    The final solution set is :
         -1 ≤ x ≤ 1

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