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

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

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    From inequality(1)：
         x ≥ 1
    From inequality(2)：
         x ≤ 3

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

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    The final solution set is :
         1 ≤ x ≤ 3
[ 2/2Inequality]
    Assignment:Find the solution set of inequality x ≥-1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ≥ -1         (1)

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    From inequality(1)：
         x ≥ -1

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    The final solution set is :
         x ≥ -1

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