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y = x³ , 即 x = y^(1/3), x = 2 时, y = 8.
绕 x 轴旋转体的体积 Vx = π∫<0, 2> y^2dx = π∫<0, 2> x^6dx
= (π/7)[x^7]<0, 2> = 2^7 π/7 = (128/7)π
绕 y 轴旋转体的体积 Vy = π∫<0, 8> x^2dy = π∫<0, 8> y^(2/3)dy
= (3π/5)[y^(5/3)]<0, 8> = 32 (3π/5) = (96/5)π
绕 x 轴旋转体的体积 Vx = π∫<0, 2> y^2dx = π∫<0, 2> x^6dx
= (π/7)[x^7]<0, 2> = 2^7 π/7 = (128/7)π
绕 y 轴旋转体的体积 Vy = π∫<0, 8> x^2dy = π∫<0, 8> y^(2/3)dy
= (3π/5)[y^(5/3)]<0, 8> = 32 (3π/5) = (96/5)π
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