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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality x^2－4 ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ^ 2 - 4 ≥0         (1)

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

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    The final solution set is :
         x ≤ -2 或  x ≥ 2
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 4－x^2 ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        4 - x ^ 2 ≥0         (1)

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    From inequality(1)：
         -2 ≤ x ≤ 2

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    The final solution set is :
         -2 ≤ x ≤ 2

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