Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 150/t >= 50 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        150 / t >= 50         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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

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    From inequalities (1) and (2)
         0 < t ≤ 3     (3)

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    The final solution set is :
         0 < t ≤ 3
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 150/t <= 60 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        150 / t <= 60         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         t ≤ 0 或  t ≥ 5/2
    From inequality(2)：
         t < 0 或  t ＞ 0

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    From inequalities (1) and (2)
         t < 0 或  t ≥ 5/2    (3)

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    The final solution set is :
         t < 0 或  t ≥ 5/2

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