Applicare la formula: $\log_{a}\left(x\right)+\log_{a}\left(y\right)$$=\log_{a}\left(xy\right)$, dove $a=10$, $x=1000$ e $y=\frac{1}{1000}$

Applicare la formula: $ab$$=ab$, dove $ab=1000\cdot 1\times 10^{-3}$, $a=1000$ e $b=\frac{1}{1000}$

Applicare la formula: $\log_{a}\left(b\right)$$=logf\left(b,a\right)$, dove $a=10$, $b=1$ e $a,b=10,1$