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

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

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    From inequality(1)：
         a < 1
    From inequality(2)：
         a ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(3)：
         a ≤ -1 或  a ≥ 1

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    From inequalities (1) and (2)
         a < 1    (4)
    From inequalities (3) and (4)
         a ≤ -1    (5)

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    The final solution set is :
         a ≤ -1

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