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

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

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    From inequality(1)：
         -0.561553 ≤ x ≤ 3.561553

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    The final solution set is :
         -0.561553 ≤ x ≤ 3.561553

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