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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （n-2）*180/n <150 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( n - 2 ) * 180 / n <150         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         0 < n < 12
    From inequality(2)：
         n < 0 或  n ＞ 0

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    From inequalities (1) and (2)
         0 < n < 12     (3)

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    The final solution set is :
         0 < n < 12

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