Răspuns :
(x+y) :2=5/2
atunci
x+y=5
a+b+c=3/2
atunci
(a+b+c):3= (3/2):3= (3/2) :(3/1) =(3/2) *(1/3)=1/2
atunci
x+y=5
a+b+c=3/2
atunci
(a+b+c):3= (3/2):3= (3/2) :(3/1) =(3/2) *(1/3)=1/2
a) daca media nr x si y = 5/2, atunci suma lor = 5/2 x 2 = 5
b) daca suma nr a,b si c = 3/2, atunci media lor = 3/2 : 3 = 1/2
b) daca suma nr a,b si c = 3/2, atunci media lor = 3/2 : 3 = 1/2