• 试题 ID 39639


$I=\iint_D f_{x y}^{\prime \prime}(x, y) \mathrm{d} x \mathrm{~d} y$ ,其中 $f_{x y}^{\prime \prime}(x, y)$ 连续,$D=\{(x, y) \mid a \leq x \leq b, c \leq y \leq d\}$
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解析:

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