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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality abs(x-2)+abs(x+1) <= 10 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         abs ( x - 2 ) + abs ( x + 1 ) <= 10         (1)

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    From inequality(1)：
         -9/2 ≤ x ≤ 11/2

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    The final solution set is :
         -9/2 ≤ x ≤ 11/2

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