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Web skærmformat. - Aarhus Universitet

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V. Matricer – 4. Determinanter 420<br />

• 3-matrix<br />

<br />

<br />

<br />

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<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

a11 a12 a13<br />

a21 a22 a23 = a11 <br />

a31 a32 a33<br />

a22 a23<br />

− a12<br />

a32 a33 a21 a23<br />

+ a13<br />

<br />

a31 a33 a21 a22<br />

a31 a32<br />

4.3. Udregn determinanter ☞ [LA] 8 Determinanter<br />

Eksempler <br />

<br />

−1<br />

2<br />

<br />

3 4<br />

= (−1) · 4 − 2 · 3 = −10<br />

<br />

<br />

1<br />

2 3<br />

<br />

<br />

4<br />

5 6<br />

<br />

2<br />

3 0<br />

<br />

<br />

= 1 · 5<br />

6<br />

<br />

<br />

3 0<br />

− 2 · 4<br />

6<br />

<br />

<br />

2 0<br />

+ 3 · 4<br />

5<br />

<br />

2 3<br />

= (5 · 0 − 6 · 3) − 2(4 · 0 − 6 · 2)<br />

+3(4 · 3 − 5 · 2)<br />

= −18 + 24 + 6<br />

= 12<br />

4.4. Nem vej til areal ☞ [LA] 8 Determinanter<br />

Eksempel

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