Question

Aflati trei nr naturale stiind ca 2 cate 2 au media aritmetica:
a) 13; 14 si 16
b) 15; 19 si 25

Answer 1

(a+b)/2 =13     ⇒a+b=26
(b+c)/2=14      ⇒b+c=28
(a+c)/2=16      ⇒a+c=32
----------------Adunandu-le
a+b+c=43

a+b+c=43
a+b=26
-----------Scazandu-le
c=17

a+b+c=43
b+c=28
-----------Scazandu-le
a=15

a+b+c=43
a+c=32
-----------Scazandu-le
b=11
Similar cazul b.