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

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

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    From inequality(1)：
         a ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(2)：
         0 ≤ a ≤ 3
    From inequality(3)：
         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)
         0 ≤ a ≤ 3    (4)
    From inequalities (3) and (4)
         0 ≤ a ≤ 3    (5)

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    The final solution set is :
         0 ≤ a ≤ 3

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