Question

determinati cifrele x si y stiind ca :
x, (y6)₊y, (6x)₊6,(xy)=x₊y₊7. pss am pus 25 de puncte dar explicati dau coroana.. pls

Answer 1

x* (y*6/99) + y* (6*x/99) + 6*(xy/99) = x+y+7
(99x+y*6)/99 + (99y+6*x)/99 + (99*6 + xy)/99 = x+y+7  / *99
99x + 10y + 6 + 99y + 60 + x + 594 + 10x + y = 99x + 99y + 693
110x - 99x + 110y - 99y + 660 = 693
11x + 11y = 33 / impartim la 11
x + y = 3

daca x=1   atunci  y=2
         x=2              y=1

deci avem perechile (1,2) si (2,1)