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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 4x－200 <－6x <6x－200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        4 * x - 200 < -6 * x         (1)
         -6 * x <6 * x - 200         (2)

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    From inequality(1)：
         x < 20
    From inequality(2)：
         x ＞ 50/3

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    From inequalities (1) and (2)
         50/3 < x < 20     (3)

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    The final solution set is :
         50/3 < x < 20

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