Question

Sa se afle 3 nr naturala , stind ca 2 cate 2 au media artimetica  respectiv 9,33.40.

Answer 1

(a+b):2=9⇒a+b=9x2=18
(b+c):2=33⇒b+c=33x2=66
(c+a):2=40⇒c+a=40 x 2=80
Adunam cele trei ecuatii si obtinem:
2a + 2b + 2c =164
2(a + b + c)= 164
a+b+c=164:2=82
a+b=18
⇒c=82-18=64
b+c=66
⇒a=82-66=16
b=82-(16+64)=82-80=2