completeză tabelul....
![Completeză Tabelul class=](https://ro-static.z-dn.net/files/d5b/0cf5e454cd85ab9afd12718d6d09000d.jpg)
a=5
b=7
c=6
a×b= 5×7=35
b×c=7×6=42
a+c= 5+6=11
a=9
a×b=63 => b=63:9=7
a+c=14 => c= 14-9=5