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4 !: :wu ü - GitHub Pages · « 4. 1 D = {(x ,y) | 1 ! x ! 2, 0 ! y ! 1} qb qz! ! D (x 2 + x y + y2)dx dy =! 2 1" ! 1 0 (x 2 + x y + y2)dy dx =! 2 1 (x 2 y + 1 2 x y2 + 1 3 y3) 1
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