Răspunsuri

2014-09-18T09:19:18+03:00
A+b=25,3a+6b+3c=3(a+2b)+3c=3(a+b+b)+3c=3(25+b)+3c=
75+3b+3c=3b+3c=-75,impartim la 3,b+c=-25,
b=25-a,