Question

Stiind ca a+b=8,calculati media artimetica pt. nr 5a+b+9 si 2a+6b+1​ va rog

Answer 1

Răspuns:

33

Explicație pas cu pas:

$m_a=\frac{5a+b+9+2a+6b+1}{2}=\frac{5a+2a+b+6b+9+1}{2}=\frac{7a+7b+10}{2}=\frac{7(a+b)+10}{2}= \frac{7*8+10}{2}=\\ =\frac{56+10}{2}=\frac{66}{2}=33\\ \boxed{m_a=33}$