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由y=|x|和y=3所围成的封闭图形.绕x轴旋转一周.则所得旋转体的表面积为 .
由y=|x|和y=3所围成的封闭图形.绕x轴旋转一周.则所得旋转体的表面积为 .
发布时间:2021-02-20 13:16:14
由y=|x|和y=3所围成的封闭图形,绕x轴旋转一周,则所得旋转体的表面积为
.
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答案:
分析:
由y=|x|和y=3所围成的封闭图形,绕x轴旋转一周,则所得旋转体是一个圆柱挖去两个圆锥的几何体,求出侧面积之和即可.
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