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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x <18 <2x .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
         x <18         (1)
        18 <2 * x         (2)

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    From inequality(1)：
         x < 18
    From inequality(2)：
         x ＞ 9

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    From inequalities (1) and (2)
         9 < x < 18     (3)

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    The final solution set is :
         9 < x < 18

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