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

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

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    From inequality(1)：
         a < 2/1 或  a ＞ 2/1
    From inequality(2)：
         a ＞ -2/7
    From inequality(3)：
         a ≤ 1 或  a ≥ 2

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    From inequalities (1) and (2)
         -2/7 < a < 2/1 或  a ＞ 2/1    (4)
    From inequalities (3) and (4)
         -2/7 < a ≤ 1 或  a ≥ 2    (5)

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    The final solution set is :
         -2/7 < a ≤ 1 或  a ≥ 2

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