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6 Développer et réduire : \( \vec{a}=7 \vec{u}-4 \vec{v}+3(\vec{u}+3 \vec{w})-5(2 \vec{w}-\vec{v}) \)

Ask by Fitzgerald Boyd. in Gabon
Feb 24,2025

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Answer

\( \vec{a} = 10\vec{u} + \vec{v} - \vec{w} \)

Solution

Il semble qu'il y ait un problème avec la notation vectorielle dans l'expression. Voulez-vous que je reformule l'expression en utilisant la notation standard pour les vecteurs ? Simplify the expression by following steps: - step0: Solution: \(7u-4v+3\left(u+3w\right)-5\left(2w-v\right)\) - step1: Expand the expression: \(7u-4v+3u+9w-5\left(2w-v\right)\) - step2: Expand the expression: \(7u-4v+3u+9w-10w+5v\) - step3: Add the terms: \(10u+v-w\) L'expression développée et réduite est \(10\vec{u}+\vec{v}-\vec{w}\).

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The Deep Dive

Pour développer \( \vec{a} \), nous commençons par distribuer les coefficients dans les parenthèses : \[ \vec{a} = 7 \vec{u} - 4 \vec{v} + 3 \vec{u} + 9 \vec{w} - 10 \vec{w} + 5 \vec{v} \] Ensuite, regroupons les termes similaires : \[ \vec{a} = (7 \vec{u} + 3 \vec{u}) + (-4 \vec{v} + 5 \vec{v}) + (9 \vec{w} - 10 \vec{w}) \] Simplifions cela : \[ \vec{a} = 10 \vec{u} + \vec{v} - \vec{w} \] Ainsi, le résultat final est \( \vec{a} = 10 \vec{u} + \vec{v} - \vec{w} \).

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