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I heard that it is difficult to be an Olympic athlete, right? Can you give me some examples? Students who have taken the exam before.
Let me give you an example (I think it is very difficult, although I am good at math and in Grade 5): There are several natural numbers greater than 0, and their average value is 10. If the largest one is removed, the average value of the remaining numbers is 9; If the smallest one is removed, the average of the remaining numbers is 1 1. What are these numbers at most? What is the biggest one?

Answer:

Solution: Set the number of (A+ 1).

10×(a+ 1)-9a

= 10a+ 10-9a

=a+ 10

10(a+ 1)— 1 1a

= 10a+ 10- 1 1a

= 10-a a+ 1= 10

9+ 10= 19

10-a & gt; 0

A max = 9

A: The maximum number is 10 and the maximum number is 19.