Persiapan Ulangan 1

Jawab: A

\begin{equation*}
\begin{split}
& ^a \log \frac 1b \:.\: ^b \log \frac 1c \:.\: ^c \log \frac 1a \\\\
& ^a \log b^{-1} \:.\: ^b \log c^{-1} \:.\: ^c \log a^{-1} \\\\
& -1 \:.\: ^a \log b \:.\: -1 \:.\: ^b \log c \:.\: -1 \:.\: ^c \log a \\\\
& -1 \:.\: \cancel{^a \log b} \:.\: \cancel{^b \log c} \:.\: \cancel{^c \log a} \\\\
& -1
\end{split}
\end{equation*}