👤

daca a*b+a*c=36 si b+c=9 atunci determinati numarul natural a.

Răspuns :

a×b+a×c=36 b+c=9 (b+c)=36 a×9=36 36:9=4 a=4
[tex]ab+ac=36 \\ b+c=9 \\ ab+ac=36 \\ a(b+c)=36 \\ 9a=36 \\ a=36:9 \\ \boxed{a=4}[/tex]