Question

media artimetica a numerelor rationale 7,6;6,5 si x este egala cu 7,1 aflati numarul x

Answer 1

Ma=(7,6+6,5+x)/3
(14,1+x)/3=7,1
14,1+x=3·7,1
x=21,3-14,1
x=7,2

Answer 2

$\hbox{ Media aritmetica } \frac{7.6+6.5+x}{3}= 7.1$

$7.6+6.5+x=7.1\cdot 3$

$14.1+x=21.3$

$\boxed{\boxed{x=7,2}}$