Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 40-2n >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 - 2 * n >0         (1)

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    From inequality(1)：
         n < 20

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    The final solution set is :
         n < 20
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 40-2n <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 - 2 * n <0         (1)

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    From inequality(1)：
         n ＞ 20

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    The final solution set is :
         n ＞ 20

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