Răspuns :
x+y=10x
y=9x
(x, 9x)=12
[x, 9x]=9x
x*9x = (x, 9x)*[x, 9x]
x*9x = 12*9x
x=12
y=108
y=9x
(x, 9x)=12
[x, 9x]=9x
x*9x = (x, 9x)*[x, 9x]
x*9x = 12*9x
x=12
y=108
x+y=10x=x+y;⇒ y=10x-x=9*x, ;
cum (1;9)=1
x este cmmdc
dar cmmdc=12, deci
x=12
atunci
y=9x=108
singura pereche posibila este (12;108)
verificare 12+108=120=10*12