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

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

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    From inequality(1)：
         x < 0 或  x ＞ 0
    From inequality(2)：
         x ＞ -1

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    From inequalities (1) and (2)
         -1 < x < 0 或  x ＞ 0    (3)

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    The final solution set is :
         -1 < x < 0 或  x ＞ 0

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