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要计算 y = f(x) 、 x in [a,b] 绕y轴旋转在 x 中积分产生的体积,哪种方法最自然?
要计算 y = f(x) 、 x in [a,b] 绕y轴旋转在 x 中积分产生的体积,哪种方法最自然?
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