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Difference between revisions of "2007 Cyprus MO/Lyceum/Problems"

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== Problem 1 ==
 
== Problem 1 ==
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If <math>x-y=1</math>,then the value of the expression <math>K=x^2+x-2xy+y^2-y</math> is
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A. <math>2</math>
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 +
B. <math>-2</math>
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C.  <math>1</math>
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D. <math>-1</math>
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E. <math>0</math>
  
 
[[2007 Cyprus MO/Lyceum/Problem 1|Solution]]
 
[[2007 Cyprus MO/Lyceum/Problem 1|Solution]]

Revision as of 10:25, 6 May 2007

Problem 1

If $x-y=1$,then the value of the expression $K=x^2+x-2xy+y^2-y$ is

A. $2$

B. $-2$

C. $1$

D. $-1$

E. $0$

Solution

Problem 2

Solution

Problem 3

Solution

Problem 4

Solution

Problem 5

Solution

Problem 6

Solution

Problem 7

Solution

Problem 8

Solution

Problem 9

Solution

Problem 10

Solution

Problem 11

Solution

Problem 12

Solution

Problem 13

Solution

Problem 14

Solution

Problem 15

Solution

See also

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