\(y=\frac{\left|\begin{array}{lll}a & j & c \\ d & k & f \\ g & l & i\end{array}\right|}{\left|\begin{array}{lll}a & b & c \\ d & e & f \\ g & h & i\end{array}\right|}=\frac{\left|\begin{array}{ccc}1 ...y=|ajcdkfgli||abcdefghi|=|10−171410101||12−1701011|=14+0+(−70)−0−10−00+0+(−7)−0−1−14=−66−22=3
