Răspunsuri

2014-10-05T19:16:26+03:00
A+b=15
b+c=13
a+c=14
a=15-b
b+c=13
15-b+c=14  b-c=1
adun ultimele doua ecuatii si avem 2b=14  b=7
a=15-7=8
b+c=13  c=13-7=6
5a+5b+5c=5(8+7+6)=105
3a+3b+3c=3x21=63


2014-10-05T19:20:15+03:00
A=8 b=7 c=6 acestea. Sunt răspunsurile care mi-au iesit mie.