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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (5x−21)/(x−9) ≥2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 5 * x - 21 ) / ( x - 9 ) ≥2         (1)
        From the definition field of divisor
         x - 9 ≠ 0        (2 )

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    From inequality(1)：
         x ≤ 1 或  x ≥ 9
    From inequality(2)：
         x < 9 或  x ＞ 9

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    From inequalities (1) and (2)
         x ≤ 1 或  x ＞ 9    (3)

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    The final solution set is :
         x ≤ 1 或  x ＞ 9

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