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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 6 <= a-1 <2a+4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        6 <= a - 1         (1)
         a - 1 <2 * a + 4         (2)

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    From inequality(1)：
         a ≥ 7
    From inequality(2)：
         a ＞ -5

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    From inequalities (1) and (2)
         a ≥ 7    (3)

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    The final solution set is :
         a ≥ 7

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