How to solve this?

A square board that has an area of 25 square inches is to be cut into pieces, each of which is a square with sides of lengh 1, 2, or 3 inches,What is the least number of such square pieces into which the board
can be cut?

Ａ５
Ｂ６
Ｃ７
Ｄ８
Ｅ９

Ans D
Mine is B

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Jessica发表于 2002-10-21 14:06 | 只看该作者

妈呀，恶毒的ETS！

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sandwolf发表于 2002-10-18 20:42 | 只看该作者

你如果按面积算：设三个小方块分别有Ａ／Ｂ／Ｃ块，则25＝Ａ+4Ｂ+9Ｃ，求least则可得Ｃ＝2，Ｂ＝1，Ａ＝3，故A+B+C=6。但实际上应该按边来算。这是陷阱！

想想5为边方块怎么切出两个3为边的方块？

几何题还是画图牢靠，我第一次做也上当了。

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--我在路口徘徊，不知前途何在，想化作一只飞猪，突破这重重迷障，飞向未明的远方………… --为什么是飞猪不是飞鸟？因为飞猪会露出单纯而甜美且幸福的微笑！

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