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Sagot :
Answer:
Matrix 1: -4269
Matrix 2: 1768
Matrix 3: 647.3561
Step-by-step explanation:
Matrix 1: [tex](7*19)-(31*142)=-4269[/tex]
Matrix 2: 1768
[tex]\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right][/tex]
Determinant = [tex]a(ei-fh)-b(di-fg)+c(dh-eg)[/tex]
Matrix 3: 647.3561
[tex]\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right][/tex]
Determinant = [tex]a(ei-fh)-b(di-fg)+c(dh-eg)[/tex]
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