在新西兰
求助各位了.第二题怎么解答?在此谢谢了
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关键部分被china2au的水印遮住了。。。
我就先去睡了。。
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目测是253级别的
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the question is :find the volume obtained when the shaded region is rotated through 360 about the x-axis. firstly,Thank you for the reply.
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its easy.
Get the volume for the whole area under AB line.
The white bit can be obtained by calculating the area under that AB curve.
Then convert that white area into volume.
Subtract the whole volume with the white bit volume and its done!
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thank you so much
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disk method吧好象叫。切成一片一片的，每片的面积是大圆-小圆，然后沿x axis做积分
从0到5
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