![A= \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]](/tpl/images/0215/2404/5ce2d.png)
![det \left[\begin{array}{ccc}1-a&2&3\\4&5-b&6\\7&8&9-c\end{array}\right] =0](/tpl/images/0215/2404/140c7.png)
![det \left[\begin{array}{ccc}0&2&3\\4&7&6\\7&8&8\end{array}\right] =-2(32-42)+3(32-49)=-31](/tpl/images/0215/2404/54cab.png)
![det \left[\begin{array}{ccc}2&2&3\\4&5&6\\7&8&8\end{array}\right] =2(40-48)-2(32-42)+3(32-35)=-5](/tpl/images/0215/2404/13568.png)
![det \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] =(45-48)-2(36-42)+3(32-35)=0](/tpl/images/0215/2404/373bf.png)
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