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

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

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    From inequality(1)：
         a ≥ 100
    From inequality(2)：
         a ≤ 200

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    From inequalities (1) and (2)
         100 ≤ a ≤ 200    (3)

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    The final solution set is :
         100 ≤ a ≤ 200

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