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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 9     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        9 < abs ( x + 9 )         (1)
         abs ( x + 9 ) <11         (2)

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    From inequality(1)：
         x < -18 或  x ＞ 0
    From inequality(2)：
         -20 < x < 2

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    From inequalities (1) and (2)
         -20 < x < -18 或  0 < x < 2     (3)

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    The final solution set is :
         -20 < x < -18 或  0 < x < 2

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