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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality ln(1+2d) <1/1.8 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ln ( 1 + 2 * d ) <1 / 1.8         (1)
        From the definition field of ln
         1 + 2 * x > 0        (2 )

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    From inequality(1)：
         d < 0.371454
    From inequality(2)：
         d ＞ -1/2

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    From inequalities (1) and (2)
         -1/2 < d < 0.371454     (3)

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    The final solution set is :
         -1/2 < d < 0.371454

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