Răspunsuri

2014-09-09T11:28:01+03:00
(10a+b) + (10c+d) = 47 10(a+c)+(b+d)=47 y = 47- 10x (10b+a) + (10d+c) = 173 (a+c)+10(b+d)=173, notam a+c = x si b+d = y x + 10y = 173 x+10(47-10x) = 173 x + 470-100x=173 297 = 99x x = 3 a+c=3, a=1 si c=2 y = b+d =17 , b,d<=9 b=8 si d=9 Numerele sunt 18 si 29.