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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality n(n+1)/2 <2000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         n * ( n + 1 ) / 2 <2000         (1)

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    From inequality(1)：
         -63.74753 < n < 62.74753

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    The final solution set is :
         -63.74753 < n < 62.74753

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