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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 29.12-0.135n-0.4n(n-1)/2 ≤0.4(n-1)+0.135 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        29.12 - 0.135 * n - 0.4 * n * ( n - 1 ) / 2 ≤0.4 * ( n - 1 ) + 0.135         (1)

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    From inequality(1)：
         n ≤ -12.987661 或  n ≥ 11.312661

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    The final solution set is :
         n ≤ -12.987661 或  n ≥ 11.312661

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