∫(1,1)(2,2)xy2dx+x2ydy=________.

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问题(1,1)(2,2)xy2dx+x2ydy=________.

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答案[*]

解析 因为xy2dx+x2ydy=d(x2y2),
所以∫(1,1)(2,2)xy2dx+x2ydy=x2y2(1,1)(2,2)=
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