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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 5 <-7/2k <= 6 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        5 < -7 / 2 * k         (1)
         -7 / 2 * k <= 6         (2)

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    From inequality(1)：
         k < -10/7
    From inequality(2)：
         k ≥ -12/7

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    From inequalities (1) and (2)
         -12/7 ≤ k < -10/7    (3)

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    The final solution set is :
         -12/7 ≤ k < -10/7
[ 2/2Inequality]
    Assignment:Find the solution set of inequality -4 <= -7/2k <-3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -4 <= -7 / 2 * k         (1)
         -7 / 2 * k < -3         (2)

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    From inequality(1)：
         k ≤ 8/7
    From inequality(2)：
         k ＞ 6/7

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    From inequalities (1) and (2)
         6/7 < k ≤ 8/7     (3)

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    The final solution set is :
         6/7 < k ≤ 8/7

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