Răspunsuri

2014-07-17T12:04:08+03:00
2014-07-17T12:26:12+03:00
A+2b+c= a+b+b+c

a+b= -1/2

b+c= 2/3

a+2b+c= -1/2 +2/3   aducem la acelasi numitor

a+2b+c= (-3+4)/6= 1/6