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DETERMINATI CIFRELE NECUNOSCUTE X SI Y,STIIND CA:
x,y(cu bara deasupra)+ y,x( cu bara deasupra)=7,7


Răspuns :

xy/10 + yx/10 = 77/10
(xy+yx) / 10 = 77/10
(10x+y+10y+x)/10 = 77/10
(11x+11y)/10 = 77/10
10(11x+11y) = 77 * 10
110x+110y = 770
110(x+y) = 770
x+y = 770:110
x+y = 7
deci
x=(1,2,3,4)
y=(6,5,4,3)