Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 2（X-1） ≤1+X .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * ( X - 1 ) ≤1 + X         (1)

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    From inequality(1)：
         X ≤ 3

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    The final solution set is :
         X ≤ 3
[ 2/2Inequality]
    Assignment:Find the solution set of inequality （X-9）/5 ≤2X .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( X - 9 ) / 5 ≤2 * X         (1)

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    From inequality(1)：
         X ≥ -1

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    The final solution set is :
         X ≥ -1

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