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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 60 ≤1600÷y-y ≤84 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        60 ≤1600 ÷ y - y         (1)
        1600 ÷ y - y ≤84         (2)

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    From inequality(1)：
         y ≤ -80 或  0 ≤ y ≤ 20
    From inequality(2)：
         -100 ≤ y ≤ 0 或  y ≥ 16

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    From inequalities (1) and (2)
         -100 ≤ y ≤ -80 或  16 ≤ y ≤ 20    (3)

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    The final solution set is :
         -100 ≤ y ≤ -80 或  16 ≤ y ≤ 20

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