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

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

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    From inequality(1)：
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!
    From inequality(2)：
         x ＞ -1
    From inequality(3)：
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!

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    From inequalities (1) and (2)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (4)
    From inequalities (3) and (4)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (5)

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    The final solution set is :
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!

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