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Web skærmformat. - Aarhus Universitet

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II. Integration – 1. Dobbelt integral 181<br />

så ifølge regneregel 9<br />

<br />

R<br />

<br />

(x + y)dA ≤<br />

R<br />

4dA ≤ 16<br />

1.30. Test integral regneregler ☞ [S] 12.1 Double integrals over rectangles<br />

Test<br />

Lad f(x,y) = xy, R = [1,2] × [1,2]. For integralet V = <br />

xy dA gælder uligheder<br />

R<br />

(a) 1 ≤ V ≤ 4. (b) 4 < V . (c) V < 1.<br />

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

Afkryds den rigtige:<br />

<br />

Løsning<br />

For (x,y) ∈ R gælder uligheden<br />

1 ≤ f(x,y) ≤ 4<br />

Heraf, A(R) = (2 − 1)(2 − 1) = 1,<br />

A(R) ≤ V ≤ A(R) · 4<br />

1.31. Regneregler og volumen ☞ [S] 12.1 Double integrals over rectangles<br />

Eksempel

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