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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20/t <= 60 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 / t <= 60         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         t ≤ 0 或  t ≥ 1/3
    From inequality(2)：
         t < 0 或  t ＞ 0

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    From inequalities (1) and (2)
         t < 0 或  t ≥ 1/3    (3)

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    The final solution set is :
         t < 0 或  t ≥ 1/3

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