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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 18（10-x）÷（10+x） ≤10 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        18 * ( 10 - x ) ÷ ( 10 + x ) ≤10         (1)

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    From inequality(1)：
         x ≤ -10 或  x ≥ 20/7

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    The final solution set is :
         x ≤ -10 或  x ≥ 20/7

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