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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3 ≤x+sqrt(x^2-4) ≥4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        3 ≤ x + sqrt ( x ^ 2 - 4 )         (1)
         x + sqrt ( x ^ 2 - 4 ) ≥4         (2)
        From the definition field of √
         x ^ 2 - 4 ≥ 0        (3 )

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    From inequality(1)：
         x ≥ 13/6
    From inequality(2)：
         x ≥ 5/2
    From inequality(3)：
         x ≤ -2 或  x ≥ 2

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    From inequalities (1) and (2)
         x ≥ 5/2    (4)
    From inequalities (3) and (4)
         x ≥ 5/2    (5)

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    The final solution set is :
         x ≥ 5/2

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