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x 2 y 2 dx 2xy dy
z z d √ x dxdy d x y x 2 + y 2 ≦ x
z z d √ x dxdy d x y x 2 y 2 ≦ x
∫ ∫ x 2 y 2 dxdy
∫∫x dxdy d d x y x 2 + y 2 ≤ a 2 x ≥ 0 a 0
xdy ydx x 2 y 2
y 2+x 2dydx xydydx
y x 2y+e x dx-e xdy 0
d 2f x y dxdy
xdy-ydx+a x 2+y 2 dx 0
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