2000 AMC 12竞赛试题/第12题
Problem
Let
and
be nonnegative integers such that
. What is the maximum value of
?
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Solution 1
It is not hard to see that![]()
Since
, we can rewrite this as![]()
So we wish to maximize
Which is largest when all the factors are equal (consequence of AM-GM). Since
, we set
Which gives us
so the answer is
.
Solution 2
If you know that to maximize your result you have to make the numbers as close together as possible, (for example to maximize area for a shape make it a square) then you can try to make
and
as close as possible. In this case, they would all be equal to
, so
, giving you the answer of
.
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