次の内積を求めなさい
\left[
\begin{array}{cc}
$1 & $2 \\
\end{array}
\right]
\left[
\begin{array}{cc}
$3 \\
$4 \\
\end{array}
\right]
次の内積を求めなさい
![\left[\begin{array}{cc}1 & 2 \\\end{array}\right]\left[ \begin{array}{cc}3 \\ 4 \\\end{array}\right]](http://chart.apis.google.com/chart?cht=tx&chf=bg,s,ffffff00&chco=000000ff&chs=25&chl=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D1%20%26amp%3Bamp%3B%202%20%5C%5C%5Cend%7Barray%7D%5Cright%5D%5Cleft%5B%20%5Cbegin%7Barray%7D%7Bcc%7D3%20%5C%5C%204%20%5C%5C%5Cend%7Barray%7D%5Cright%5D)
\left[
\begin{array}{cc}
$1 & $2 \\
\end{array}
\right]
\left[
\begin{array}{cc}
$3 \\
$4 \\
\end{array}
\right]
= $1 * $3 + $2 * $4
= $5
Rd(-4, 9); $1$4
Rd(-5, 7); $2$3
$1 * $3 + $2 * $4 =$5; d
