Question

8) A expressão abaixo é igual a:

a) 1
b) 3
c) 5
d) 10
e) 1000

Answer 1

$\boxed{\begin{array}{l}\sf\ell og50+\ell og40+\ell og20+\ell og2,5\\\sf =\ell og(50\cdot40\cdot20\cdot2,5)=\ell og 100\, 000\\\sf =\ell og10^5=5\ell og10=5\end{array}}$