PROBLEMAS Y SOLUCIONES
PROBLEMAS Y SOLUCIONES
7
7
◦◦
Ca
Camp
mpeo
eona
nato
to de
de Mat
Matem´
em´
at
atica
ica
Universidad de La Frontera
Universidad de La Frontera
Departamento de Matem´
Departamento de Matem´ati
atica
ca y
y Est
Estad
ad´´ıst
ıstica
ica
Universidad de La Frontera
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El objetivo principal del matem´
El objetivo principal del matem´atico
atico
consiste en formular y resolver problemas
consiste en formular y resolver problemas
“La resoluci´
“La resoluci´on de problemas
on de problemas
es el coraz´
es el coraz´on de la Matem´
on de la Matem´atica”
atica”
Soluciones de los Problemas a cargo del
Soluciones de los Problemas a cargo del
Com
Comit´
it´e Ac
e Acad´
ad´emi
emico
co del
del Cam
Campe
peona
onato
to Con
Confor
formado
mado po
por:
r:
Hern´
Hern´an Burgos Vega
an Burgos Vega
Jos´
Jos´e
e La
Labr
brin
in Par
Parra
ra
Eduardo Milman Aguilar
Eduardo Milman Aguilar
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Introducci´
Introducci´
on
on
Este peque˜
Este peque˜no libro contiene los problemas del 7
no libro contiene los problemas del 7
◦◦Campeonato de Ma-
Campeonato de
Ma-tem´
tem´atica de la Universidad de La Frontera a˜
atica de la Universidad de La Frontera a˜no 2014, junto a sus solucio-
no 2014, junto a sus
solucio-nes, material que ponemos a disposici´
nes, material que ponemos a disposici´on de cada uno de los colegas con
on de cada uno de los colegas con
la
la ´´ıntima esp
ıntima esperanza y p
eranza y pretensi´
retensi´on de que les sirvan de ayuda y motivaci´
on de que les sirvan de ayuda y motivaci´on
on
en sus clases de matem´
en sus clases de matem´atica.
atica.
Est
Estamo
amos
s con
conv
venc
encido
idos
s de
de que
que est
estudi
udian
antes
tes en
entus
tusias
iasmad
mados
os y
y mot
motiv
ivados
ados
tendr´
tendr´an
an may
mayor
or ´´exito,
exito, como
como tambi
tambi´´en,
en, pensamos
pensamos que
que problemas
problemas no
no tri-
tri-viale
viales
s y
y que
que desaf
desaf´´ıan
ıan el
el int
intelec
electo
to del
del estu
estudian
diante
te lo
lo ayu
ayudan
dan a
a organi
organizar,
zar,
contar, razonar, encontrar secuencias y algoritmos que le permiten
contar, razonar, encontrar secuencias y algoritmos que le permiten
en-tender los problemas y resolverlos, y al final del proceso sentir el placer
tender los problemas y resolverlos, y al final del proceso sentir el placer
de hab
de haber resuelto
er resuelto un probl
un problema novedoso,
ema novedoso, que inicia
que inicialmente era un
lmente era un desaf
desaf´´ıo.
ıo.
Este libro est´
Este libro est´a
a dir
dirigi
igido
do es
especi
pecialm
almen
ente
te a
a los
los col
colega
egas
s pro
profe
fesor
sores
es de
de ma-
ma-tem´
tem´atica de ense˜
atica de ense˜nanza b´
nanza b´asica y media de la regi´
asica y media de la regi´on
on de
de La
La Araucan´
Araucan´ıa,
ıa,
con el prop´
con el prop´osito
osito de
de despertar
despertar el
el inter
inter´´es
es por
por la
la resoluci´
resoluci´on y creaci´
on y creaci´on de
on de
problemas l´
problemas l´udicos y bonitos que motivan a nuestros estudiantes.
udicos y bonitos que motivan a nuestros estudiantes.
Quiero
Quiero agrad
agradecer el
ecer el impo
importante
rtante apo
aporte de
rte del co
l comit´
mit´e a
e acad´
cad´emico
emico del
del camp
campeo-
eo-nato, en la resoluci´
nato, en la resoluci´on de los problemas seleccionados, adem´
on de los problemas seleccionados, adem´as de agra-
as de
agra-decer por la lectura y correcciones del material a la profesora Elena
decer por la lectura y correcciones del material a la profesora Elena
Oli-vos del Departamento de Matem´
vos del Departamento de Matem´atica de nuestra Universidad. Debemos
atica de nuestra Universidad. Debemos
rec
reconocer
onocer tam
tambi´
bi´en
en el
el esfor
esforzado
zado y
y exc
excelen
elente
te trabajo
trabajo desar
desarrollad
rollado
o por
por el
el
profesor
profesor Jos´
Jos´e
e Labrin
Labrin en
en la
la escritura del
escritura del texto
texto en
en LaT
LaTeX.
eX.
Finalmente, es necesario destacar y reconocer el importante y decidido
Finalmente, es necesario destacar y reconocer el importante y decidido
apoyo que nos entrega la direcci´
apoyo que nos entrega la direcci´on de nuestra Universidad, sin el cual no
on de nuestra Universidad, sin el cual no
po
podr
dr´´ıamos
ıamos desarro
desarrollar
llar este Ca
este Campeon
mpeonato.
ato.
Reit
Reiteram
eramos
os nue
nuestro ´
stro ´ınt
ıntimo
imo dese
deseo
o de
de que
que este material
este material sea
sea un
un peque˜
peque˜no
no
aporte a los colegas en su pr´
aporte a los colegas en su pr´actica diaria.
actica diaria.
Dr. Hern´
Dr. Hern´an Burgos V.
an Burgos V.
Director
Director Acad´
Acad´emico
emico Campeo
Campeonato
nato de
de Matem´
Matem´atica
atica
Universidad de La Frontera
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1
1
Problemas
Problemas
Problema 1.
Problema 1.
¿Qu´
¿Qu´e
e dibujo
dibujo es
es la
la parte
parte central
central
de la estrella que se muestra en la imagen ?
de la estrella que se muestra en la imagen ?
((A
A)
)
((B
B)
)
((C
C)
)
((D
D)
)
((E
E))
Problema 2.
Problema 2.
Juan quiere
Juan quiere insertar
insertar el
el d
d´´ıgito
ıgito 3
3 en
en alg´
alg´
un lugar del n´
un lugar del n´
umero
umero
2014. ¿D´
2014. ¿D´ond
onde
e se
se debe
debe ins
inserta
ertar
r el
el d
d´´ıgi
ıgito
to 3
3 si
si el
el qui
quiere
ere que
que su
su n´
n´
umero de
umero de
cin
cinco
co d
d´´ıgi
ıgitos
tos sea
sea lo
lo m´
m´as peque˜
as peque˜
no posible?
no posible?
Problema 3.
Problema 3.
¿Qu´
¿Qu´e
e pareja
pareja de
de casas
casas fueron
fueron hechas usando
hechas usando exactamente las
exactamente las
mismas piezas de forma triangular o rectangular?
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2 2
Problema 5.
Problema 5.
Al
Alicia t
icia tiene 1
iene 10 niet
0 nietos. Fernanda es
os. Fernanda es la mayor.
la mayor. Un d
Un d´´ıa la
ıa la abuela
abuela
se da cuenta que sus nietos tienen todos edades distintas. Si la suma de las
se da cuenta que sus nietos tienen todos edades distintas. Si la suma de las
edades de sus nietos es 180, ¿Cu´
edades de sus nietos es 180, ¿Cu´al
al es
es la
la edad
edad m
m´´ınima
ınima que
que F
Fernanda
ernanda puede
puede
tener?
tener?
Problema 6.
Problema 6.
Mar
Mar´´ıa rea
ıa realiza 6
liza 6 resta
restas y obt
s y obtiene co
iene como resu
mo resultados
ltados los n
los n´´
umeros
umeros
desde el 0 al 5. Ella une los puntos de menor a mayor, comenzando en el
desde el 0 al 5. Ella une los puntos de menor a mayor, comenzando en el
punto con el resultado 0 y terminando en el punto con el resultado 5. ¿Cu´
punto con el resultado 0 y terminando en el punto con el resultado 5. ¿Cu´
al
al
figura ella obtiene?
figura ella obtiene?
((A
A)
)
((B
B)
)
((C
C)
)
((D
D)
)
((E
E))
Prob
Problema
lema 7.
7.
Alan construy´
Alan construy´o
o menos
menos castill
castillos
os de
de arena
arena que
que Mart
Mart´´ın
ın pero
pero
m´
m´as
as que
que Susana.
Susana. Luc
Luc´´ıa
ıa contruy´
contruy´
o
o m´
m´as
as castil
castillos
los que
que Alan
Alan y
y que
que Mart
Mart´´ın.
ın.
Daniela construy´
Daniela construy´o
o m´
m´as
as ca
cast
stil
illo
los q
s que
ue Mar
Martt´´ın
ın y
y men
menos
os que
que Luc´
Luc´ıa
ıa. . ¿Qu
¿Qui´
i´en
en de
de
ellos contruy´
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ENUNCIADOS DE LOS PROBLEMAS
ENUNCIADOS DE LOS PROBLEMAS 33
Problema 9.
Problema 9.
Ana tiene cuatro piezas las
Ana tiene cuatro piezas las
cuales se muestran en la imagen. Con esas
cuales se muestran en la imagen. Con esas
pie
piezas
zas ella
ella pue
puede
de cub
cubrir
rir com
comple
pletame
tament
ntee
solo una de las siguientes figuras. ¿Cu´
solo una de las siguientes figuras. ¿Cu´al
al
de las siguientes ella puede cubrir con
de las siguientes ella puede cubrir con
to-das sus piezas?
das sus piezas?
((A
A)
)
((B
B)
)
((C
C)
)
((D
D)
)
((E
E))
Problema 10.
Problema 10.
Bruno ha pintado flores en la ven-
Bruno ha pintado flores en la
ven-tana de la tienda (mire la figura). ¿C´
tana de la tienda (mire la figura). ¿C´omo se ver´
omo se ver´an
an
estas flores desde el otro lado de la ventana?
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4 4
((A
A)
)
((B
B)
)
((C
C)
)
((D
D)
)
((E
E))
Problema 13.
Problema 13.
Paula dispara flechas al objeti-
Paula dispara flechas al
objeti-vo que se muestra en la figura. Cuando ella no
vo que se muestra en la figura. Cuando ella no
acierta al objetivo, obtiene cero puntos. Paula
acierta al objetivo, obtiene cero puntos. Paula
dispara dos flechas y suma el puntaje de
dispara dos flechas y suma el puntaje de
am-bos disparos. ¿Cu´
bos disparos. ¿Cu´al de las siguientes sumas no
al de las siguientes sumas no
puede ser su puntaje?
puede ser su puntaje?
((A
A))660
0
((B
B))770
0
((C
C))880
0
((D
D))990
0
((E
E))110000
Prob
Problema
lema 14.
14.
Mar
Mar´´ıa
ıa ten´
ten´ıa
ıa el
el mis
mismo
mo n´
n´ume-
ume-ro de fichas grises, negras y blancas. Ella
ro de fichas grises, negras y blancas. Ella
uti-liz´
liz´o algunas de estas fichas para hacer una pila.
o algunas de estas fichas para hacer una pila.
En la figura, se pueden ver todas las fichas que
En la figura, se pueden ver todas las fichas que
utiliz´
utiliz´o.
o. Ella
Ella todav
todav´´ıa
ıa tiene
tiene cinco
cinco fichas
fichas que
que no
no
est´
est´an en la pila. ¿Cu´
an en la pila. ¿Cu´antas
antas fichas
fichas negra
negras
s ten
ten´´ıa
ıa
al principio?
al principio?
Prob
Problema
lema 15.
15.
A un conejo le gustan mucho las zanahorias y el repollo.
A un conejo le gustan mucho las zanahorias y el repollo.
En un
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ENUNCIADOS DE LOS PROBLEMAS
ENUNCIADOS DE LOS PROBLEMAS 55
((A
A)
)
((B
B)
)
((C
C)
)
((D
D)
)
((E
E))
Problema 17.
Problema 17.
¿Cu´
¿Cu´antos puntos hay en esta imagen?
antos puntos hay en esta imagen?
Problema 18.
Problema 18.
¿En el planeta canguro cada canguro-a˜
¿En el planeta canguro cada canguro-a˜
no tiene 20
no tiene 20 cangur
canguro-
o-meses y cada canguro-mes tiene 6 canguro-semanas. ¿Cu´
canguro-Trusted by over 1 million members
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6 6
Problema 20.
Problema 20.
Evelyn orden´
Evelyn orden´o ca
o cartas
rtas en l
en l´´ınea c
ınea como s
omo se muest
e muestra en
ra en la fi
la figura.
gura.
En cada movimiento a Evelyn se le permite intercambiar cualquier par de
En cada movimiento a Evelyn se le permite intercambiar cualquier par de
cartas. ¿Cu´
cartas. ¿Cu´al es el menor n´
al es el menor n´
umero de movimientos que Evelyn tiene que
umero de movimientos que Evelyn tiene que
hacer para conseguir la palabra ALOCADOS?
hacer para conseguir la palabra ALOCADOS?
Problema 21.
Problema 21.
Se realiza una secuencia de tri´
Se realiza una secuencia de tri´
angulos de diamantes. En la
angulos de diamantes. En la
figura se muestran las tres primeras etapas. En cada etapa se a˜
figura se muestran las tres primeras etapas. En cada etapa se a˜
nade una
nade una
ll´´ınea
ınea de
de diamantes
diamantes. En
. En las
las ll´´ıneas
ıneas inferi
inferiores
ores los
los diamantes
diamantes exter
exteriores
iores son
son de
de
color blanco
color blanco. El
. El resto de
resto de los diaman
los diamantes en el
tes en el tri´
tri´
angulo son negros. ¿Cu´
angulo son negros. ¿Cu´antos
antos
diamantes negros tiene la figura en la etapa n´
diamantes negros tiene la figura en la etapa n´
umero 6?
umero 6?
Prob
Problema
lema 22.
22.
Un canguro compr´
Un canguro compr´o juguetes y le entreg´
o juguetes y le entreg´o 150 canguro-
o 150
canguro-monedas al asistente de la tienda. Recibi´
monedas al asistente de la tienda. Recibi´
o 20 canguro-monedas de vuelta.
o 20 canguro-monedas de vuelta.
Luego cambi´
Luego cambi´o de opini´
o de opini´on y cambi´
on y cambi´o uno de los juguetes por otro. Le de-
o uno de los juguetes por otro. Le
de-¿Con
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ENUNCIADOS DE LOS PROBLEMAS
ENUNCIADOS DE LOS PROBLEMAS 77
Problema 23.
Problema 23.
Escribe cada uno de los n´
Escribe cada uno de los n´
umeros 0,
umeros 0,
1, 2, 3, 4, 5, 6 en los cuadrados para hacer la adici´
1, 2, 3, 4, 5, 6 en los cuadrados para hacer la adici´on
on
co
corr
rrec
ecta
ta. . ¿Qu´
¿Qu´e
e d
d´´ıg
ıgit
ito
o es
esta
tar´
r´a en el cuadrado gris?
a en el cuadrado gris?
Prob
Problema
lema 24.
24.
¿Cu´
¿Cu´al es el mayor n´
al es el mayor n´umero de
umero de
cuadrados peque˜
cuadrados peque˜
nos que pueden ser sombrea-
nos que pueden ser
sombrea-dos para que ning´
dos para que ning´un cuadrado de la forma:
un cuadrado de la forma:
He
Hech
cho
o de
de cu
cuatr
atro
o cu
cuad
adrad
rados
os so
som
mbr
brea
eado
dos
s pe-
pe-que˜
que˜
nos aparezca en la figura?
nos aparezca en la figura?
Problema 25.
Problema 25.
Nicol ha escrito cada uno de los
Nicol ha escrito cada uno de los
n´
n´umeros del 1 al 9 en las celdas de la tabla 3
umeros del 1 al 9 en las celdas de la tabla 3
×
×
3.
3.
Solo cuatro de estos n´
Solo cuatro de estos n´umeros se pueden ver en
umeros se pueden ver en
la figura. Nicol se ha dado cuenta de que para el
la figura. Nicol se ha dado cuenta de que para el
n´
n´umero 5 la suma de los n´
umero 5 la suma de los n´umeros en las celdas
umeros en las celdas
vecinas es igual a 13 (las celdas vecinas son
vecinas es igual a 13 (las celdas vecinas son
aquellas celdas que comparten lados). Se dio
aquellas celdas que comparten lados). Se dio
cuenta que lo mismo se aplica para el n´
cuenta que lo mismo se aplica para el n´
umero
umero
6.
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8 8
(A)
(A)
a < b < c
a < b < c
(B)
(B)
a < c < b
a < c < b
(C)
(C)
b < a < c
b < a < c
(D)
(D)
b < c < a
b < c < a
(E)
(E)
c < b < a
c < b < a
Problema 28.
Problema 28.
¿
¿Q
Qu´
u´e
e n
n´´
umero est´
umero est´a en el medio de
a en el medio de
22
33
y
y
44
55
??
Prob
Problema
lema 29.
29.
En el n´
En el n´umero 2014 el ´
umero 2014 el ´
ult
ultimo
imo d
d´´ıgi
ıgito
to es
es m´
m´as grande que la
as grande que la
suma
suma de
de los
los otros
otros tres
tres d
d´´ıgitos.
ıgitos. ¿Cu´
¿Cu´
antos a˜
antos a˜
nos atr´
nos atr´as fue la ´
as fue la ´ultima vez que
ultima vez que
ocurri´
ocurri´o esto?
o esto?
Pro
Proble
blema
ma 30
30..
L
La
a lo
lon
ngi
gitu
tud
d d
de
e lo
los
s la
lad
dos
os
de
del l he
hex´
x´
ago
agono
no reg
regul
ular
ar gr
gran
ande
de es
es do
dos
s ve
vece
cess
la
la lo
long
ngit
itud
ud de
de lo
los
s la
lado
dos
s de
del l he
hex´
x´
ag
agon
ono
o re-
re-gular peque˜
gular peque˜
no. El hex´
no. El hex´agono peque˜
agono peque˜
no tiene
no tiene
una superficie de 4 cm
una superficie de 4 cm
22. ¿Cu´
. ¿Cu´al es el ´
al es el ´area del
area del
hex´
hex´agono
agono grande
grande??
Prob
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ENUNCIADOS DE LOS PROBLEMAS
ENUNCIADOS DE LOS PROBLEMAS 99
Problema 35.
Problema 35.
Una abuela, su hija y su nieta pueden decir este a˜
Una abuela, su hija y su nieta pueden decir este a˜no (2014)
no (2014)
que
que la
la suma de
suma de sus
sus edade
edades
s es
es 100. ¿En
100. ¿En qu
qu´´e
e a˜
a˜
no naci´
no naci´o la nieta si cada una
o la nieta si cada una
de las edades es una potencia de 2?
de las edades es una potencia de 2?
Prob
Problema
lema 36.
36.
Pablo puso algunos cua-
Pablo puso algunos
cua-dros rectangulares en la pared. Por cada
dros rectangulares en la pared. Por cada
foto puso un clavo en la pared 2,5 m por
foto puso un clavo en la pared 2,5 m por
encima del suelo y adjunt´
encima del suelo y adjunt´o una larga ca-
o una larga
ca-dena de 2 m en las dos esquinas
dena de 2 m en las dos esquinas
superio-res. ¿Cu´
res. ¿Cu´al de las siguientes fotos es la m´
al de las siguientes fotos es la m´
as
as
cercana al suelo (formato: ancho en cm
cercana al suelo (formato: ancho en cm
×
×
altura en cm)?
altura en cm)?
(A)60
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10 10
Problema 40.
Problema 40.
En la imagen hay un dado especial.
En la imagen hay un dado especial.
Los n´
Los n´umeros en las caras opuestas siempre suman
umeros en las caras opuestas siempre suman
lo mismo. Los n´
lo mismo. Los n´umeros que no podemos ver en la
umeros que no podemos ver en la
imagen son todos n´
imagen son todos n´
umer
umeros
os pri
primos
mos. . ¿Qu´
¿Qu´e
e n´
n´umero es
umero es
opuesto al 14?
opuesto al 14?
Problema 41.
Problema 41.
Ana ha caminado 8 kil´ometros
Ana ha caminado 8 kil´
ometros con una vel
con una velocidad de 4km/h
ocidad de 4km/h..
Ahora ella correr´
Ahora ella correr´a alg´
a alg´
un tiempo con una velocidad de 8 km/h. ¿Cu´
un tiempo con una velocidad de 8 km/h. ¿Cu´anto
anto
tiempo le queda por correr para que su velocidad promedio global sea de
tiempo le queda por correr para que su velocidad promedio global sea de
5 km/h?
5 km/h?
Problema 42.
Problema 42.
Un jugador de ajedrez jug´
Un jugador de ajedrez jug´o 40 partidos y acumul´
o 40 partidos y acumul´o 25 pun-
o 25
pun-tos (una victoria cuenta como un punto, un empate cuenta como medio
tos (una victoria cuenta como un punto, un empate cuenta como medio
punto, y una derrota cuenta como cero puntos). ¿Cu´
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ENUNCIADOS DE LOS PROBLEMAS
ENUNCIADOS DE LOS PROBLEMAS 1111
Pro
Proble
blema
ma 46
46..
En la imagen que se mues-
En la imagen que se
mues-tra, Karina quiere a˜
tra, Karina quiere a˜
nadir algunos segmentos de
nadir algunos segmentos de
ll´´ınea de
ınea de tal
tal manera que
manera que cada
cada uno
uno de
de los
los siete
siete
pun
puntos tenga el
tos tenga el mismo n´
mismo n´
umero de conexiones a
umero de conexiones a
los otros puntos. ¿Cu´
los otros puntos. ¿Cu´al es el menor n´
al es el menor n´
umero de
umero de
segmentos
segmentos de
de ll´´ınea
ınea que
que Karina
Karina debe
debe dibujar?
dibujar?
Problema 47.
Problema 47.
La imagen mues-
La imagen
mues-tra el mismo cubo desde dos
tra el mismo cubo desde dos
pun-tos de vista diferentes.
tos de vista diferentes.
Est´
Est´a construido a partir de 27
a construido a partir de 27
cubos peque˜
cubos peque˜
nos, algunos de ellos
nos, algunos de ellos
son de color negro y algunos son
son de color negro y algunos son
blancos.
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Pro
Proble
blema
ma 51.
51.
En la
En la
imagen,
imagen,
P
P T
T
es tangen-
es
tangen-te
te a
a un
una
a ci
circ
rcun
unfe
fere
ren-
n-cia
cia
C
C
con centro
con centro
O
O
y
y
P
P B
B
bisectriz del ´
bisectriz del ´angulo
angulo
T
T P
P A
A
. Calcula el ´
. Calcula el ´angu-
angu-lo
lo
T
T BP
BP
..
Prob
Problema
lema 52.
52.
Considere el conjunto de todos los n´
Considere el conjunto de todos los n´
umeros
umeros de
de 7
7 d
d´´ıgit
ıgitos
os
que se pueden obtener utilizando, para cada n´
que se pueden obtener utilizando, para cada n´umero,
umero, tod
todos
os los
los d
d´´ıgito
ıgitos
s 1,
1,
2, 3, ..., 7. Enumere los n´
2, 3, ..., 7. Enumere los n´umeros de la serie en orden creciente y divida la
umeros de la serie en orden creciente y divida la
lista exactamente en la mitad en dos partes de igual tama˜
lista exactamente en la mitad en dos partes de igual tama˜
no. ¿Cu´
no. ¿Cu´al es el
al es el
´´ultimo n´
ultimo n´
umero de la primera mitad?
umero de la primera mitad?
AB
ABC
C
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ENUNCIADOS DE LOS PROBLEMAS
ENUNCIADOS DE LOS PROBLEMAS 1313
Problema 56.
Problema 56.
¿Cu´
¿Cu´antos cuadril´
antos cuadril´ateros de
ateros de
cualquier tama˜
cualquier tama˜
no se muestran en la figu-
no se muestran en la
figu-ra?
ra?
Problema 57.
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