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

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

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

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    The final solution set is :
         3/4 ≤ a ≤ 2

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