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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x/（x-20） >10 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x / ( x - 20 ) >10         (1)
        From the definition field of divisor
         x - 20 ≠ 0        (2 )

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    From inequality(1)：
         20 < x < 200/9
    From inequality(2)：
         x < 20 或  x ＞ 20

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    From inequalities (1) and (2)
         20 < x < 200/9     (3)

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    The final solution set is :
         20 < x < 200/9

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