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

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

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    From inequality(1)：
         x ≤ -1.899969 或  x ≥ 1.899969

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    The final solution set is :
         x ≤ -1.899969 或  x ≥ 1.899969

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