Question

gente por favor me ajudem preciso entregar até às 18 HORAS​

Answer 1

$\text{f(a.b)}=\text{f(a) + f(b)} \\\\ \text{f(4)}=2$

Achando f(1) : façamos a = 4 e b  = 1

$\text f(4.1)=\text f(4)+\text f(1) \\\\ \text f(1) = \text f(4)-\text f(4)\\\\ \huge\boxed{\text f(1)=0}\checkmark$

AChando f(8) : fazendo a = 2 e b = 2

$\text f(2.2) = \textf(2)+\text f(2) \\\\ \text f(4) = 2\text f(2) \\\\ 2\text f(2) = 2\\\\ \boxed{\text f(2) = 1} \\\\ \text{fazendo a = 4 e b = 2 }\\\\ \text f(4.2)=\text f(4)+\text f(2) \\\\ \text f(8) = 2+1 \\\\ \huge\boxed{\text f(8)=3\ }\checkmark$