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

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

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    From inequality(1)：
         -1.828427 < b < 3.828427
    From inequality(2)：
         b ≤ -1 或  b ≥ 3

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    From inequalities (1) and (2)
         -1.828427 < b ≤ -1 或  3 ≤ b < 3.828427    (3)

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    The final solution set is :
         -1.828427 < b ≤ -1 或  3 ≤ b < 3.828427

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