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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality n/(2*n+2) >9/20 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         n / ( 2 * n + 2 ) >9 / 20         (1)
        From the definition field of divisor
         2 * x + 2 ≠ 0        (2 )

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    From inequality(1)：
         n < -1 或  n ＞ 9
    From inequality(2)：
         n < -1 或  n ＞ -1

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    From inequalities (1) and (2)
         n < -1 或  n ＞ 9    (3)

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    The final solution set is :
         n < -1 或  n ＞ 9

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