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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 4 <= abs(-4/9m+9) <6 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        4 <= abs ( -4 / 9 * m + 9 )         (1)
         abs ( -4 / 9 * m + 9 ) <6         (2)

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    From inequality(1)：
         m ≤ 45/4 或  m ≥ 117/4
    From inequality(2)：
         27/4 < m < 135/4

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    From inequalities (1) and (2)
         27/4 < m ≤ 45/4 或  117/4 ≤ m < 135/4    (3)

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    The final solution set is :
         27/4 < m ≤ 45/4 或  117/4 ≤ m < 135/4

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