想问一下大佬们y=x²绕y= 1旋转形成的旋转体体积用定积分2πxfxdx的原理怎么做� 知乎 Template




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tomski想问一下大佬们y=x²绕y= 1旋转形成的旋转体体积用定积分2πxfxdx的原理怎么做� 知乎 coloring