Welke 2x2 matrix  [ aij ]  bedoelt men
als je weet dat   aij = i.j   ( 1 ≤   i , j   ≤ 2 ) ?
  A   B   C  D   E
\(\small\begin{bmatrix}a_1 & a_2 \\a_2 & a_4 \end{bmatrix}\) \(\small\begin{bmatrix}11 & 12 \\21 & 22 \end{bmatrix}\) \(\small\begin{bmatrix}a & a \\a & a \end{bmatrix}\) \(\small\begin{bmatrix}1 & 2 \\2 & 4 \end{bmatrix}\) \(\small\begin{bmatrix}a_{11} & a_{12} \\a_{21} & a_{21} \end{bmatrix}\)
A    B    C    D    E

[ 5-5940 - op net sinds 9.4.10-(E)-20.10.2026 ]

Translation in   E N G L I S H

Which 2x2 matrix  [aij]  we have in mind,
given that   aij= i.j   (1 ≤ i , j ≤ 2) ?
  A   B   C  D   E
\(\small\begin{bmatrix}a_1 & a_2 \\a_2 & a_4 \end{bmatrix}\) \(\small\begin{bmatrix}11 & 12 \\21 & 22 \end{bmatrix}\) \(\small\begin{bmatrix}a & a \\a & a \end{bmatrix}\) \(\small\begin{bmatrix}1 & 2 \\2 & 4 \end{bmatrix}\) \(\small\begin{bmatrix}a_{11} & a_{12} \\a_{21} & a_{21} \end{bmatrix}\)

Oplossing - Solution

Met \(\large \left [ a_{ij} \right ] \) bedoelt men in het algemeen de matrix \(\begin{bmatrix}a_{11}&a_{12}\\a_{21}&a_{22}\end{bmatrix} \).
Maar als  aij = i.j  zal wegens  1.1=1   1.2=2   2.1=2   2.2=4  deze matrix worden : \(\begin{bmatrix}1&2\\2&4\end{bmatrix} \)
gricha