Cho ba điểm \(A\left( {1;6;...

D

- Hướng dẫn giải

\(\left( {ABC} \right):ax + by + cz + d = 0\)

\(\begin{array}{l} \Rightarrow \left\{ \begin{array}{l}a + 6b + 2c + d = 0\\5a + b + 3c + d = 0\\4a + 6c + d = 0\end{array} \right. \Leftrightarrow \left\{ \begin{array}{l}a = \frac{{ - 7d}}{{55}}\\b = \frac{{ - 13d}}{{110}}\\c = \frac{{ - 9d}}{{110}}\end{array} \right.\\ \Rightarrow \left( {ABC} \right):14x + 13y + 9z - 110 = 0\end{array}\)