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

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

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    From inequality(1)：
         -1/2 < m < 0
    From inequality(2)：
         m < -√2/√5 或  0 < m < √2/√5
    From inequality(3)：
         m < 0 或  m ＞ 0

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    From inequalities (1) and (2)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (4)
    From inequalities (3) and (4)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (5)

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    The final solution set is :
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!

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