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问题 1
A) 求通过围绕指定线旋转由给定曲线界定的区域获得的固体的体积 V。y=5 sqrt(25-x^2), y = 0, x = 1, x = 4; 关于 x 轴,带有区域/实体形式的草图(也包括磁盘旋转)
B)求通过围绕指定线旋转给定曲线所界定的区域获得的固体的体积V。y = (1/25)x^2, x = 5, y = 0; 关于 x 轴,带有区域/实体形式的草图(也包括磁盘旋转)