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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 9*x^2+6*x+1 ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        9 * x ^ 2 + 6 * x + 1 ≥0         (1)

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    From inequality(1)：
         x ≤ -1/3 或  -1/3 ≤ x ≤ -1/3 或  x ≥ -1/3

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    The final solution set is :
         x ≤ -1/3 或  -1/3 ≤ x ≤ -1/3 或  x ≥ -1/3

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