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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1 <= n^2/2-36*n+73/2 <= n .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1 <= n ^ 2 / 2 - 36 * n + 73 / 2         (1)
         n ^ 2 / 2 - 36 * n + 73 / 2 <= n         (2)

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    From inequality(1)：
         n ≤ 1 或  n ≥ 71
    From inequality(2)：
         1 ≤ n ≤ 73

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    From inequalities (1) and (2)
         1 ≤ n ≤ 1 或  71 ≤ n ≤ 73    (3)

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    The final solution set is :
         1 ≤ n ≤ 1 或  71 ≤ n ≤ 73

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