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)
        From the definition field of √
         1 - 4 * x ≥ 0        (3 )

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    From inequality(1)：
         a ≤ 0 或  0 ≤ a ≤ 0 或  a ≥ 0
    From inequality(2)：
         a ≥ -2
    From inequality(3)：
         a ≤ 1/4

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    From inequalities (1) and (2)
         -2 ≤ a ≤ 0 或  0 ≤ a ≤ 0 或  a ≥ 0    (4)
    From inequalities (3) and (4)
         -2 ≤ a ≤ 0 或  0 ≤ a ≤ 0 或  0 ≤ a ≤ 1/4    (5)

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    The final solution set is :
         -2 ≤ a ≤ 0 或  0 ≤ a ≤ 0 或  0 ≤ a ≤ 1/4

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