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标题: QYQ Section3-13请教！ [打印本页]

作者: bigp 时间: 2005-1-5 04:15
标题: QYQ Section3-13请教！

13. What is the volume of a certain rectangular solid?

(1) Two adjacent faces of the solid have areas 15 and 24, respectively.

(2) Each of two opposite faces of the solid has area 40.

问题在于怎么理解（2），抛开（1）不看，我觉得（2）的意思就是该长方体每个面的面积都是40。因为，相对的两个面的面积分别为40，共有3对向对面。故而我得到答案为B，可钱书中理解的是异于面积为15，24两个面儿的另一对相对面儿，不是很理解得说。

谢谢指点。

作者: hchen_cd 时间: 2005-1-5 06:24
(2) each of two opposite faces means that there exist two faces, they are opposite to each other, and both have area 40. Not each of "any" two opposite faces.

作者: bigp 时间: 2005-1-5 08:50
谢谢hchen_cd兄的解答。

作者: coloryoung 时间: 2014-10-4 11:51

thanks.

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