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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -1 ≤9r+5/4r ≤1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -1 ≤9 * r + 5 / 4 * r         (1)
        9 * r + 5 / 4 * r ≤1         (2)

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    From inequality(1)：
         r ≥ -0.097561
    From inequality(2)：
         r ≤ 0.097561

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    From inequalities (1) and (2)
         -0.097561 ≤ r ≤ 0.097561    (3)

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    The final solution set is :
         -0.097561 ≤ r ≤ 0.097561

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