Question

Rezolvati ecuatia xy (bara sus)+yx (bara sus)=77,unde x,y sunt cifre nenule in sistemul zecimal.

Answer 1

10x+y+10y+x=77
11y+11x=77
11(y+x)=77
y+x=77:11
y+x=7
ai solutiile x=1, y=6 si viceversa
x=2 si y=5 si viceversa
x=3 si y=4 si viceversa