A. 4 B. 5 C. 8 D. 7

作者: tihaiku 人气: - 评论: 0
问题 A. 4 B. 5 C. 8 D. 7
选项
答案 D
解析 D [解析]把水视为几何体,由图可知甲乙中水的体积之和恰好等于圆锥容器的体 积。假设圆锥容器的体积是甲中“水圆锥”体积的n倍,由于圓锥容器的高和底面半径均为“水圆锥”的2倍,结合圆锥体积计算公式,必有n是2的次幂。又因为乙中水的体积是甲中水体 积的n—1倍,因此n—1必然等于2的次幂减去1,符合条件的只有D项。

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