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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1-X >= 0 <= 1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1 - X >= 0         (1)
         0 <= 1         (2)

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    From inequality(1)：
         X ≤ 1
    From inequality(2)：
         X ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!

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    From inequalities (1) and (2)
         X ≤ 1    (3)

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    The final solution set is :
         X ≤ 1

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