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Determina cifrele x si y astfel incat x,x+y,y=13,2
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Răspuns :

X,x + y,y=13,2
X=1(fals)
Y=1(fals)
Deci
X=6
Y=6
Lucasela
x,x+y,y=13,2, inmultim cu 10
=>xx+yy=132; 10x+x+10y+y=132
11x+11y=132
11(x+y)=132
x+y=12
(x,y)={(3,9),(4,8),(5,7),(6,6),(7,5),(8,4),(9,3)}