Răspuns :
[tex]a = 4 \times b \\ a - b = 45 \: = > a = b + 45 \\ \\ rezolvare: \\ 4b - b = 45 \\ 3b = 45 \\ b = 45 \div 3 \\ b = 15 \\ \\ a = b + 45 = 15 + 45 = 60 \\ \\ verificare: \\ 60 - 15 = 45[/tex]
Succes!
Succes!