Question

Aflati media aritmetica a zece numere rationale,stiind ca media aritmetica a primelor doua numere este 5, media aritmetica a urmatoarelor trei numere este 25,iar media aritmetica a ultimelor cinci numere este 200.

Answer 1

............vezi daca te ajuta

Answer 2

     
$m_{a1} = \frac{x_1+x_2}{2}=5 \;\;\;\;\;=\ \textgreater \ \;\;x_1+x_2=5 \cdot 2 = \boxed{10} \\ \\ m_{a2} = \frac{x_3+x_4+x_5}{3}=25\;\;\;\;\;=\ \textgreater \ \;\;x_3+x_4+x_5=25 \cdot 3 = \boxed{75} \\ \\ m_{a3} = \frac{x_6+x_7+x_8+x_9+x_{10}}{5}=200 \\ =\ \textgreater \ \;\;x_6+x_7+x_8+x_9+x_{10}=200 \cdot 5 = \boxed{1000} \\ \\ m_a = \frac{(x_1+x_2)+(x_3+x_4+x_5)+(x_6+x_7+x_8+x_9+x_{10})}{10} = \\ = \frac{(10)+(75)+(1000)}{10} =\frac{1085}{10}=\boxed{\boxed{\frac{217}{2}} = \boxed{108,5}}$