Question

Queria saber Dada a matriz A=(aij) 2x2, onde aij= i+J, qual é soma da Diagonal Secundaria: *

Answer 1

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$\boxed{\begin{array}{l}\underline{\mathbb{O}\tt bserve~a~matriz~a~seguir\!:}\\\sf A=\begin{bmatrix}\sf a_{11}&\sf a_{12}&\sf a_{13}\\\sf a_{21}&\sf a_{22}&\sf a_{23}\\\sf a_{31}&\sf a_{32}&\sf a_{33}\end{bmatrix}\\\underline{\rm elementos~que~comp\tilde oem~a~diagonal~principal\!:}\\\sf a_{11}~~a_{22}~~a_{33}\\\underline{\rm elementos~que~comp\tilde oem~a~diagonal~secund\acute aria\!:}\\\sf a_{13}~~a_{22}~~a_{31}\\\sf o ~exerc\acute icio~pede~a~soma~a_{13}+a_{22}+a_{31}.\end{array}}$

$\Large\boxed{\begin{array}{l}\sf a_{13}=1+3=4\\\sf a_{22}=2+2=4\\\sf a_{31}=3+1=4\\\sf a_{13}+a_{22}+a_{31}=4+4+4=12\end{array}}$