Question

va am nevoie urgent
dau coroană

Answer 1

$m_a = \frac{a+b}{2} = 10 \Rightarrow a+b=20 \\ \\ m_a= \frac{a+b+10}{3} = \frac{20+10}{3} = 10 \\ \\ a + b + c = \frac{3}{5} \\ \\ m_a = \frac{a+b+c}{3} = \frac{ \frac{3}{5}}{3} = \frac{3}{5} * \frac{1}{3} = \frac{1}{5} .$