Difference between revisions of "2016 AIME II Problems/Problem 3"
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Let <math>x,y,</math> and <math>z</math> be real numbers satisfying the system | Let <math>x,y,</math> and <math>z</math> be real numbers satisfying the system | ||
| − | <math>\log_2(xyz-3+\log_5 x)=5</math> | + | <math>\log_2(xyz-3+\log_5 x)=5</math>, |
| − | <math>\log_3(xyz-3+\log_5 y)=4</math> | + | <math>\log_3(xyz-3+\log_5 y)=4</math>, |
| − | <math>\log_4(xyz-3+\log_5 z)=4</math> | + | <math>\log_4(xyz-3+\log_5 z)=4</math>, |
Find the value of <math>|\log_5 x|+|\log_5 y|+|\log_5 z|</math>. | Find the value of <math>|\log_5 x|+|\log_5 y|+|\log_5 z|</math>. | ||
Revision as of 12:49, 15 January 2017
Let 
and 
be real numbers satisfying the system
,
,
,
Find the value of 
.
Solution
First, we get rid of logs by taking powers: 
, 
, and 
. Adding all the equations up and using the 
property, we have 
, so we have 
. Solving for 
by substituting 
for 
in each equation, we get 
, so adding all the absolute values we have 
.
Solution by Shaddoll
See also
| 2016 AIME II (Problems • Answer Key • Resources) | ||
| Preceded by Problem 2 |
Followed by Problem 4 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 | ||
| All AIME Problems and Solutions | ||
