Question

Se stie ca:a×b+a×c=42 si b+c=7afla valoarea lui a

Answer 1

a(b+c)=42
7a=42
a=42:7
a=6

Answer 2

axb+axc=42       ax(b+c)=42       ax7=42      a=42;7       a=6
b+c=7 
proba  6x(b+c)=6x7=42