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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 60/x+40/x-40 ≤4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        60 / x + 40 / x - 40 ≤4         (1)
        From the definition field of divisor
        x ≠ 0        (2 )
        From the definition field of divisor
        x ≠ 0        (3 )

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    From inequality(1)：
         x ≤ 0 或  x ≥ 25/11
    From inequality(2)：
         x < 0 或  x ＞ 0
    From inequality(3)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         x < 0 或  x ≥ 25/11    (4)
    From inequalities (3) and (4)
         x < 0 或  x ≥ 25/11    (5)

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    The final solution set is :
         x < 0 或  x ≥ 25/11

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