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Web skærmformat. - Aarhus Universitet

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II. Integration – 1. Dobbelt integral 172<br />

Hjørner (1,1),(2,1),(1,2),(2,2).<br />

y<br />

2<br />

1<br />

1 2<br />

1.15. Riemann sum til beregning ☞ [S] 12.1 Double integrals over rect. . .<br />

Eksempel 1 - fortsat<br />

Hjørner (1,1),(2,1),(1,2),(2,2) og ∆A = 1.<br />

Den dobbelte Riemann sum giver<br />

<br />

R = [0,2] × [0,2], f(x,y) = 16 − x 2 − 2y 2 ≥ 0<br />

(16 − x<br />

R<br />

2 − 2y 2 )dA<br />

≈ f(1,1) + f(1,2) + f(2,1) + f(2,2)<br />

= 13 + 7 + 10 + 4<br />

= 34<br />

x

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