Răspuns :
[tex]2 \times a = 82 - 66 + 2 \times 1 \\ 2 \times a = 16 + 2 \\ 2 \times a = 18 \\ a = 18 \div 2 \\ a = 9[/tex]
Proba :
[tex]2 \times 9 = 82 - 66 + 2 \times 1 \\ 18 = 16 + 2 \\ 18 = 18[/tex]
Proba :
[tex]2 \times 9 = 82 - 66 + 2 \times 1 \\ 18 = 16 + 2 \\ 18 = 18[/tex]