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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0 <（2+x）/（2-x） <1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        0 < ( 2 + x ) / ( 2 - x )         (1)
         ( 2 + x ) / ( 2 - x ) <1         (2)
        From the definition field of divisor
         2 - x ≠ 0        (3 )

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    From inequality(1)：
         -2 < x < 2
    From inequality(2)：
         x < 0 或  x ＞ 2
    From inequality(3)：
         x < 2 或  x ＞ 2

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    From inequalities (1) and (2)
         -2 < x < 0     (4)
    From inequalities (3) and (4)
         -2 < x < 0     (5)

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    The final solution set is :
         -2 < x < 0

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