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Web skærmformat. - Aarhus Universitet

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II. Integration – 2. Itereret integral 190<br />

2.13. Test itereret integral ☞ [S] 12.2 Iterated integrals<br />

Test<br />

Lad f(x,y) = xy. Det itererede integral 2 2<br />

xy dxdy er<br />

1 1<br />

(a) 9<br />

2<br />

. (b) 9<br />

4<br />

Løsning<br />

. (c) 6<br />

4 .<br />

2 2<br />

1<br />

1<br />

2 2 x<br />

xy dxdy =<br />

1 2<br />

= 3<br />

2 2 y<br />

2 2 1<br />

= 3 3 9<br />

=<br />

2 2 4<br />

x=2<br />

Afkryds den rigtige:<br />

y dy<br />

x=1<br />

(a) (b) (c)<br />

<br />

2.14. Øvelse gør mester ☞ [S] 12.2 Iterated integrals<br />

Eksempel<br />

R = [0,1] × [0,1], f(x,y) = 2x + 2ye x<br />

Partial integral<br />

A(x) =<br />

1<br />

0<br />

(2x + 2ye x )dy

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