Răspunsuri

2014-05-20T20:53:42+03:00
B+C=9
C+A=11daca il inmultim cu -1⇒
-C-A=-11
adunand cele 2 ecuatii⇒
B+C-C-A=9-11
B-A=-2 inmultind cu -1⇒
A-B=2
2014-05-20T20:55:00+03:00