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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -1 <= lnx <= 1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -1 <= ln x         (1)
         ln x <= 1         (2)
        From the definition field of ln
        x > 0        (3 )

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    From inequality(1)：
         x ≥ 0.367879
    From inequality(2)：
         x ≤ 2.718282
    From inequality(3)：
         x ＞ 0

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    From inequalities (1) and (2)
         0.367879 ≤ x ≤ 2.718282    (4)
    From inequalities (3) and (4)
         0.367879 ≤ x ≤ 2.718282    (5)

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    The final solution set is :
         0.367879 ≤ x ≤ 2.718282

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