Question

daca media aritmetica a numerelor 2;7; x este egala cu 8 , atunci x=....

Answer 1

$\frac{2+7+x}{3} =8 \\ \\ 9+x=8*3 \\ \\ 9+x=24 \\ \\ x=24-9 \\ \\ x=15 \\ \\ Verificare: \frac{2+7+15}{3} = \frac{24}{3} =8$