Question

Problema clasa a 8 a​

Answer 1

$\it a=\sqrt5-2+2+\sqrt5=2\sqrt5;\ \ \ b=10\sqrt5\\ \\ m_a=\dfrac{a+b}{2}=\dfrac{2\sqrt5+10\sqrt5}{2}=\dfrac{12\sqrt5}{2}=6\sqrt5$