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

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

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    From inequality(1)：
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!
    From inequality(2)：
         a ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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    From inequalities (1) and (2)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (3)

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    The final solution set is :
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!

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