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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3 <1-x <= 4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        3 <1 - x         (1)
        1 - x <= 4         (2)

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    From inequality(1)：
         x < -2
    From inequality(2)：
         x ≥ -3

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    From inequalities (1) and (2)
         -3 ≤ x < -2    (3)

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    The final solution set is :
         -3 ≤ x < -2

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