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计算由 y = ln x 、 x in [1, e] 绕 y 轴旋转生成的体积(圆柱壳)。结合分部法和替换。
计算由 y = ln x 、 x in [1, e] 绕 y 轴旋转生成的体积(圆柱壳)。结合分部法和替换。
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