Question

aflati nr prime xy care verifica relatia 0,x(y)-0,y(x)=0,0(1)*16

Answer 1

0,x(y)-0,y(x)=0,0(1)*16

(10x+y-x)/90-(10y+x-y)/90=1/90  × 16

(9x+y)/90-(9y+x)/90=16/90

9x+y-9y-x=16
8x-8y=16
x-y=2
x=2+y
solutii :
x=5      y=3
x=7      y=5