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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 4 <5/a ≤5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        4 <5 / a         (1)
        5 / a ≤5         (2)
        From the definition field of divisor
        x ≠ 0        (3 )

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    From inequality(1)：
         0 < a < 5/4
    From inequality(2)：
         a ≤ 0 或  a ≥ 1
    From inequality(3)：
         a < 0 或  a ＞ 0

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    From inequalities (1) and (2)
         1 ≤ a < 5/4    (4)
    From inequalities (3) and (4)
         1 ≤ a < 5/4    (5)

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    The final solution set is :
         1 ≤ a < 5/4

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