题目内容：
设u=u(x，y)有二阶连续偏导数，且满足
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答案解析：
简答题：设u=u(x，y)有二阶连续偏导数，且满足
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(Ⅰ)求D绕x轴旋转一周所得旋转体的体积V1；(Ⅱ)求D绕直线y=1旋转一周所得旋转体的体积V2；(Ⅲ)求D绕直线旋转一周所得旋转体的体积V3．
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第（47）题答案
第（47）题答案