Question

Media aritmetica a trei nr este 7,6 . Media aritmetica a primelor doua este 6,6 ,iar a ultimelor doua este 8,2. Care sunt numerele? Va rog e urgent!

Answer 1

Ma=(a+b+c)/3=7.6 => a+b+c=7.6x3=22.8
(a+b)/2=6.6 => a+b=6.6x2=13.2
(b+c)/2=8.2 => b+c=8.2x2=16.4
c=22.8-(a+b)=22.8-13.2 => c=9.6
b=16.4-c=16.4-9.6=6.8
a=13.2-b=13.2-6.8=6.4

R: a=6.4, b=6.8, c=9.6

Answer 2

(a+b+c)/3=7.6 = a+b+c=7.6x3=22.8
(a+b)/2=6.6 = a+b=6.6x2=13.2
(b+c)/2=8.2 = b+c=8.2x2=16.4
c=22.8-(a+b)=22.8-13.2 = c=9.6
b=16.4-c=16.4-9.6=6.8
a=13.2-b=13.2-6.8=6.4
 Sper ca te-am ajutat!