MathDB
Problems
Contests
International Contests
Tournament Of Towns
1995 Tournament Of Towns
(445) 1
(445) 1
Part of
1995 Tournament Of Towns
Problems
(1)
TOT 445 1995 Spring A J1 a/b+b/c+c/a and a/c+c/b+b/a are integers
Source:
7/9/2024
Prove that if
a
a
a
,
b
b
b
and
c
c
c
are integers and the sums
a
b
+
b
c
+
c
a
a
n
d
a
c
+
c
b
+
b
a
\frac{a}{b}+\frac{b}{c}+\frac{c}{a} \,\,\,\, and \,\,\,\, \frac{a}{c}+\frac{c}{b}+\frac{b}{a}
b
a
+
c
b
+
a
c
an
d
c
a
+
b
c
+
a
b
are also integers, then we have
∣
a
∣
=
∣
v
∣
=
∣
c
∣
|a| = |v| = |c|
∣
a
∣
=
∣
v
∣
=
∣
c
∣
.(A Gribalko)
number theory