Question

Ayuda por favor, es para ahorita​

Answer 1

Respuesta:

espero haberte ayudado

Explicación paso a paso:

(-8+0+168)-(0+30+8)

160-38

122

Answer 2

Respuesta:

$\begin{pmatrix}1&0&0\\ 0&1&0\\ 0&0&1\end{pmatrix}$

Explicación paso a paso:

$\begin{pmatrix}1&-2&7\\ 4&8&5\\ 0&6&-1\end{pmatrix}^{-1}=\begin{pmatrix}-\frac{19}{61}&\frac{20}{61}&-\frac{33}{61}\\ \frac{2}{61}&-\frac{1}{122}&\frac{23}{122}\\ \frac{12}{61}&-\frac{3}{61}&\frac{8}{61}\end{pmatrix}$

$\begin{pmatrix}1&-2&7\\ 4&8&5\\ 0&6&-1\end{pmatrix}^{-1}\\\\\\=\begin{bmatrix}1&-2&7&\mid \:&1&0&0\\ 4&8&5&\mid \:&0&1&0\\ 0&6&-1&\mid \:&0&0&1\end{bmatrix}\\\\\\=\begin{bmatrix}1&0&0&\mid \:&-\frac{19}{61}&\frac{20}{61}&-\frac{33}{61}\\ 0&1&0&\mid \:&\frac{2}{61}&-\frac{1}{122}&\frac{23}{122}\\ 0&0&1&\mid \:&\frac{12}{61}&-\frac{3}{61}&\frac{8}{61}\end{bmatrix}$

$=\begin{pmatrix}-\frac{19}{61}&\frac{20}{61}&-\frac{33}{61}\\ \frac{2}{61}&-\frac{1}{122}&\frac{23}{122}\\ \frac{12}{61}&-\frac{3}{61}&\frac{8}{61}\end{pmatrix}\\\\\\\begin{pmatrix}1&-2&7\\ 4&8&5\\ 0&6&-1\end{pmatrix}\\\\\\=\begin{pmatrix}4&8&5\\ 0&6&-1\\ 0&0&\frac{61}{12}\end{pmatrix}\\\\\\=\begin{pmatrix}1&0&0\\ 0&1&0\\ 0&0&1\end{pmatrix}$