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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (30+(30+n-1))×n÷2 ≤1200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 30 + ( 30 + n - 1 ) ) × n ÷ 2 ≤1200         (1)

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    From inequality(1)：
         -86.6861 ≤ n ≤ 27.6861

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    The final solution set is :
         -86.6861 ≤ n ≤ 27.6861

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