Question

sa se determine a si b daca a-b= 5 si ab+ba=77

Answer 1

Răspuns:

ab+ba=77

10a+b+10b+a =77

11a+11b =77 =>11(a+b)=77=>a+b=77:11=>a+b =7

a+b+a-b=5+7

2a=12=>a=12:2=>a=6

6-b=5=>b=6-5=>b=1