Question

Determinati nr. naturale care:

au diferenta diferenta 129,catul 7 si restul 3 

Answer 1

a-b=129
a:b=7 rest 3⇒ a=7b+3
inlocuim in I relatie
7b+3-b=129
6b=129-3
b=126/6
b=21
a=129+b=129+21
a=150
 verificare
150:21=7
147
==3

Answer 2

$a-b=129 \\ a:b=7 \ rest \ 3 \to \boxed{a= 7b+3} \\ \\ 7b+3-b=129 \\ 6b+3=129 \\ 6b=129-3 \\ 6b=126 \\ b=126:6 \\ \boxed{b=21} \ \text{Am gasit numarul b asa ca putem afla pe a } \\ \\ a-b=129 \\ \boxed{a=150}$