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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （500-100/（60000-X））×0.75＋（500-100/（20000-X））×0.25 ≥500-100/30000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 500 - 100 / ( 60000 - X ) ) × 0.75 + ( 500 - 100 / ( 20000 - X ) ) × 0.25 ≥500 - 100 / 30000         (1)
        From the definition field of divisor
         60000 - x ≠ 0        (2 )
        From the definition field of divisor
         20000 - x ≠ 0        (3 )

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    From inequality(1)：
         X ≤ 6972.243623
    From inequality(2)：
         X ∈ R （R为全体实数），即在实数范围内，不等式恒成立！
    From inequality(3)：
         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 ≤ 6972.243623    (4)
    From inequalities (3) and (4)
         X ≤ 6972.243623    (5)

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    The final solution set is :
         X ≤ 6972.243623

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