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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 85 <= (83+87x)/3 <= 90 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        85 <= ( 83 + 87 * x ) / 3         (1)
         ( 83 + 87 * x ) / 3 <= 90         (2)

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    From inequality(1)：
         x ≥ 1.977011
    From inequality(2)：
         x ≤ 2.149425

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    From inequalities (1) and (2)
         1.977011 ≤ x ≤ 2.149425    (3)

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    The final solution set is :
         1.977011 ≤ x ≤ 2.149425

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