helpme~

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/30 06:24:48
helpme~
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helpme~
helpme~

helpme~
图像为
圆:x^2+y^2=(2a)^2
在第一象限的部分
先dy后dx.
二重积分的几何意义就是图形的面积
现在知道图形是圆:x^2+y^2=(2a)^2
在第一象限的部分
所以就是π*4a^2/4=πa^2
多给点分吧

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