Răspunsuri

2014-10-15T10:10:04+03:00
b+c = 9=>b=9-c
c+a=14=a=14-c

14-c-(9-c) = 
14-c-9+c=
5
2014-10-15T10:21:11+03:00
B+c=9 c=9-b
inlocuim c aici 
c+a=14
9-b+a=14
a-b=5
1 5 1