Ivan Shishkin, Rye (1878)

Problems/Linear algebraExerciseReviewed

Un exemple facile de matrice

by Ancient Tree·
3
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This score reflects both the level of the required concepts and the difficulty of the solution.Ce score tient compte à la fois du niveau des notions nécessaires et de la difficulté de la résolution.

  1. 1–10First steps / middle schoolPremiers pas / collège
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These levels are approximate guides.Ces niveaux sont des repères approximatifs.
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Considérer la matrice
A=(251−3)A = \begin{pmatrix} 2 & 5 \\ 1 & -3 \end{pmatrix}

  1. Quelle est la taille de AA ?
  2. Quel est le coefficient a21a_{21} ?
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Solution by Ancient TreeEN

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  1. AA is a 2×22\times 2 matrix.
  2. a21a_{21} is the coefficient on the second line and first column. So a21=1a_{21}=1.
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