2007 Cyprus MO/Lyceum/Problem 1: Difference between revisions
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==Solution== | ==Solution== | ||
<math>x^2+x-2xy+y^2-y=x^2-2xy+y^2+x-y=(x-y)^2+x-y=(1)^2+1=2\ | <math>x^2+x-2xy+y^2-y=x^2-2xy+y^2+x-y=(x-y)^2+x-y=(1)^2+1=2\Longrightarrow\mathrm{ A}</math> | ||
==See also== | ==See also== | ||
Revision as of 14:56, 6 May 2007
Problem
If 
, then the value of the expression 
is
Solution
