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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.1/5000+0.9/10000 >= 1/(10000-x) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.1 / 5000 + 0.9 / 10000 >= 1 / ( 10000 - x )         (1)
        From the definition field of divisor
         10000 - x ≠ 0        (2 )

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    From inequality(1)：
         x ≤ 10000/11
    From inequality(2)：
         x ∈ R （R为全体实数），即在实数范围内，不等式恒成立！

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    From inequalities (1) and (2)
         x ≤ 10000/11    (3)

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    The final solution set is :
         x ≤ 10000/11

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