2007 AMC 8 第 11 题

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所有题目均经美国数学协会(MAA)官方合法授权使用。

11.

瓷片 IIIIIIIIIIIIIVIV 被平移,使每个瓷片分别与长方形 AABBCCDD 中的一个重合。在最终排列中,任意两个相邻瓷片公共边上的两个数字必须相同。哪个瓷片被平移到长方形 CC

Tiles I,I, II,II, IIIIII and IVIV are translated so one tile coincides with each of the rectangles A,A, B,B, CC and D.D. In the final arrangement, the two numbers on any side common to two adjacent tiles must be the same. Which of the tiles is translated to Rectangle C?C?

II

IIII

IIIIII

IVIV

无法确定

cannot be determined

答案:D
知识点:逻辑推理
难度评级:1270
小提示:

寻找只出现在一个瓷片边上的数字

Look for edge numbers that appear on only one tile.

大提示:

0055 会先确定瓷片 IIIIII 的位置,再决定 CC 中的瓷片

The 00 and 55 force the placement of Tile IIIIII before deciding which tile is in CC.

解答:

只有瓷片 IIIIII 的边上有 00,所以瓷片 IIIIII 必须放在 CCDD,使这个边可以在外侧。

瓷片 IIIIII 的右边还有 55,且没有其他瓷片有 55。因此瓷片 IIIIII 必须放在 DD,让 55 在外侧。

11 标在瓷片 IIIIII 的左边,唯一能与之匹配的是瓷片 IVIV,所以瓷片 IVIV 放在 CC

所以正确答案是 D

Only Tile IIIIII has a 00 on an edge, so Tile IIIIII must be placed in CC or DD, where that edge can be on the outside.

Tile IIIIII also has a 55 on its right edge, and no other tile has a 55. Therefore Tile IIIIII must be placed in DD, with its 55 on the outside.

The only tile that can match the 11 on the left edge of Tile IIIIII is Tile IVIV, so Tile IVIV is placed in CC.

Thus, D is the correct answer.

第 10 题#10
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