Răspunsuri

2014-09-18T10:24:03+03:00
A+b=5,b+c=7
2a+5b+3c=2a+5a+5b+3(7-b)=7a+5b+21-3b=7a+2b=-21,a=5-b
35-7b+2b=-21,56=5b,b=11,2
a+11,2=5,a=-6,2
b+c=7,11,2+c=7,c=-4,2

1 5 1