计算,2(x2+y2))dxdy.

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问题 计算,2(x2+y2))dxdy.

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答案令[*]=2(x2+y2),解得x2+y2=[*], 则[*]min{[*],2(x2+y2)}dxdy =[*]2(x2+y2)dxdy+[*]dxdy =2[*].

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