Question

Care este media aritmetica a trei nr.,stiind ca doua cate doua au media aritmetica:11,36 si 32?

Answer 1

$\dfrac{a+b}{2}=11\Rightarrow a+b=22$

$\dfrac{b+c}{2}=36\Rightarrow b+c=72$

$\dfrac{c+a}{2}=32\Rightarrow c+a=64$

Adunam relatiile

$2(a+b+c)=158\Rightarrow a+b+c=79\Rightarrow m_a=\dfrac{a+b+c}{3}=\dfrac{79}{3}$