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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality ((ln(1+1/x))^-2)*1/(x*(1+x)) >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( ( ln ( 1 + 1 / x ) ) ^ -2 ) * 1 / ( x * ( 1 + x ) ) >0         (1)
        From the definition field of divisor
        x ≠ 0        (2 )
        From the definition field of ln
         1 + 1 / x > 0        (3 )
        From the definition field of divisor
         x * ( 1 + x ) ≠ 0        (4 )

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    From inequality(1)：
         x ＞ 0
    From inequality(2)：
         x < 0 或  x ＞ 0
    From inequality(3)：
         x < -1 或  x ＞ 0
    From inequality(4)：
         x < -1 或  -1 < x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         x ＞ 0    (5)
    From inequalities (3) and (5)
         x ＞ 0    (6)
    From inequalities (4) and (6)
         x ＞ 0    (7)

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    The final solution set is :
         x ＞ 0

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