Đáp án:
\(\left\{ \begin{array}{l}
x = 4\\
y = 15\\
z = - 6
\end{array} \right.\)
Giải thích các bước giải:
\(\begin{array}{l}
c.\left\{ \begin{array}{l}
- \frac{2}{3} = - \frac{x}{6}\\
- \frac{2}{3} = \frac{{10}}{{ - y}}\left( {y \ne 0} \right)\\
- \frac{2}{3} = \frac{z}{9}
\end{array} \right.\\
\to \left\{ \begin{array}{l}
x = \frac{2}{3}.6\\
y = 10:\frac{2}{3}\\
z = - \frac{2}{3}.9
\end{array} \right.\\
\to \left\{ \begin{array}{l}
x = 4\\
y = 15\\
z = - 6
\end{array} \right.
\end{array}\)
