1998 AMC 8 第 18 题
先试着解答 1998 AMC 8 第 18 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 1998 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
18.
如下图所示，一张长方形纸先从下往上折，再从左往右折，最后在 处打一个孔。展开后纸是什么样子？
As indicated by the diagram below, a rectangular piece of paper is folded bottom to top, then left to right, and finally, a hole is punched at What does the paper look like when unfolded?
小提示：
展开时先展开最后一次折叠
Unfold the last fold first.
大提示：
每次折叠都会把孔关于折痕反射一次
Each fold reflects the hole across the fold line.
解答：
最后折好的长方形是原纸的右上四分之一，孔打在这个折后长方形的左上部分。
展开时，孔会分别关于水平和竖直折痕反射。只有选项 B 有这四个对应位置的孔。
所以正确答案是 B。
The final folded rectangle is the upper-right quarter of the original sheet, and the hole is punched in the upper-left part of that folded rectangle.
Unfolding reflects the hole across the horizontal and vertical fold lines. Only choice B has the four corresponding holes.
Thus, the correct answer is B .
其他年份的第 18 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
- 1993 AMC 8
- 1994 AMC 8
- 1995 AMC 8
- 1996 AMC 8
- 1997 AMC 8
- 1999 AMC 8
- 2000 AMC 8
- 2001 AMC 8
- 2002 AMC 8
- 2003 AMC 8
- 2004 AMC 8
- 2005 AMC 8
- 2006 AMC 8
- 2007 AMC 8
- 2008 AMC 8
- 2009 AMC 8
- 2010 AMC 8
- 2011 AMC 8
- 2012 AMC 8
- 2013 AMC 8
- 2014 AMC 8
- 2015 AMC 8
- 2016 AMC 8
- 2017 AMC 8
- 2018 AMC 8
- 2019 AMC 8
- 2020 AMC 8
- 2022 AMC 8
- 2023 AMC 8
- 2024 AMC 8
- 2025 AMC 8
- 2026 AMC 8