Question

alguém me ajuda com isso por favor??? é muito urgente

Answer 1

1 ) $\left[\begin{array}{ccc}2&5&10\\5&8&13\\10&13&18\end{array}\right]$
2 ) 2b = 6 
     b = 3

     b + c = - 1
     3 + c = - 1
     c = - 1 + 3 = 2

     a + b = 9
     a = 9 - 3 = 6

     2a - 3d = 18
     2 · 6 - 3d = 18
     - 3d = 18 - 12 = 6
    - d = 2   . ( -1 )
    d = -2

3 ) 2b = 0
     b = 0

     a + b - 1 = 0
     a + b = 1
     a + 0 = 1      a = 1

     a - 3c = 0
     - 3c = -1     . ( -1 )
    c = $\dfrac{1}{3}$

4 )a) A + B = $\left[\begin{array}{ccc}2&-1&1\\1&1&9\\\end{array}\right]$.
b) A - B = $\left[\begin{array}{ccc}2&1&-3\\-9&1&-3\\\end{array}\right]$.
c) B - A = $\left[\begin{array}{ccc}-2&-1&3\\9&-1&3\\\end{array}\right]$.
d) 3A + 2B = $\left[\begin{array}{ccc}6&-2&1\\-2&3&21\\\end{array}\right]$.
e) A - 2B = $\left[\begin{array}{ccc}2&-2&3\\6&1&15\\\end{array}\right]$.
f) 3A - B = $\left[\begin{array}{ccc}6&1&-5\\-17&3&-3\\\end{array}\right]$.

5 ) a) $\left[\begin{array}{ccc}2&-1&0\\5&4&6\\\end{array}\right]$.
b) $\left[\begin{array}{ccc}1&0&-1\\3&0&4\\2&5&3\end{array}\right]$.
c) $\left[\begin{array}{ccc}2&-4\\0&1\\-1&3\end{array}\right]$.

6) a) $\left[\begin{array}{ccc}17&39\\2&4\\\end{array}\right]$.
b) $\left[\begin{array}{ccc}29&24\\23&22\\26&4\end{array}\right]$.
c) $\left[\begin{array}{ccc}-3&17\\-7&-8\\9&26\end{array}\right]$.

7 ) A + B = $\left[\begin{array}{ccc}3\\-4\\9\end{array}\right]$.
X - (A + B) = 0
X - $\left[\begin{array}{ccc}3\\-4\\9\end{array}\right]$ = 0
$x_{11}$ - 3 = 0       $x_{11}$ = 3
$x_{21}$ - (-4) = 0   $x_{21}$ = -4
$x_{31}$ - 9 = 0      $x_{31}$ = 9

X = $\left[\begin{array}{ccc}3\\-4\\9\end{array}\right]$.