Question

calculati media aritmetica ponderata a numerelor reale 3 radical 5 cu ponderea 4. si 7radical 5 cu ponderea 3​

Answer 1

$\frac{4 \times 3 \sqrt{5} + 3 \times 7 \sqrt{5} }{4 + 3} =$

$= \frac{12 \sqrt{5} + 21 \sqrt{5} }{7} =$

$= \frac{33 \sqrt{5} }{7}$