Răspuns :
a+b+b+c=a+2b+c
a+2b+c= [tex] \frac{-1}{2} + \frac{2}{3} =-0,5+0,6=1,1[/tex]
a+2b+c= [tex] \frac{-1}{2} + \frac{2}{3} =-0,5+0,6=1,1[/tex]
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
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