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

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== Problem 5 ==
 
== Problem 5 ==
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If the remainder of the division of <math>a</math> with <math>35</math> is <math>23</math>, then the remainder of the division of <math>a</math> woth <math>7</math> is
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 +
A. <math>1</math>
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 +
B. <math>2</math>
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C. <math>3</math>
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D. <math>4</math>
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E. <math>5</math>
  
 
[[2007 Cyprus MO/Lyceum/Problem 5|Solution]]
 
[[2007 Cyprus MO/Lyceum/Problem 5|Solution]]

Revision as of 12:14, 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

Given the formula $f(x) = 4^x$, then $f(x+1)-f(x)$ equals to

A. $4$

B. $4^x$

C. $2$•$4^x$

D. $4^{x+1}$

E. $3$•$4^x$

Solution

Problem 3

A cyclist drives form town A to town B with velocity $40 \frac{km}{h}$ and comes back with velocity $60 \frac{km}{h}$. The mean valocity in $\frac{km}{h}$ for the total distance is

A. $45$

B. $48$

C. $50$

D. $55$

E. $100$

Solution

Problem 4

We define the operation $a*b = \frac{1+a}{1+b^2}$, $\forall a,b \in \real$.

The value of $(2*0)*1$ is

A. $2$

B. $1$

C. $0$

D. $\frac{1}{2}$

E. $\frac{5}{2}$


Solution

Problem 5

If the remainder of the division of $a$ with $35$ is $23$, then the remainder of the division of $a$ woth $7$ is

A. $1$

B. $2$

C. $3$

D. $4$

E. $5$

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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