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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality abs(r-5)     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
         abs ( r - 5 ) < sqrt ( 10 )         (1)
         sqrt ( 10 ) < r + 5         (2)

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    From inequality(1)：
         1.837722 < r < 8.162278
    From inequality(2)：
         r ＞ -1.837722

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    From inequalities (1) and (2)
         1.837722 < r < 8.162278     (3)

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    The final solution set is :
         1.837722 < r < 8.162278

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