2009 AIME II Problems/Problem 2
Contents
Problem
Suppose that ,
, and
are positive real numbers such that
,
, and
. Find
Solution 1
First, we have:
Now, let , then we have:
This is all we need to evaluate the given formula. Note that in our case we have ,
, and
. We can now compute:
Similarly, we get
and
and therefore the answer is .
Solution 2
We know from the first three equations that =
,
=
, and
=
. Substituting, we get
+
+
We know that =
, so we get
+
+
+
+
The and the
cancel out to make
, and we can do this for the other two terms. We obtain
+
+
= +
+
=
.
See Also
2009 AIME II (Problems • Answer Key • Resources) | ||
Preceded by Problem 1 |
Followed by Problem 3 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 | ||
All AIME Problems and Solutions |
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