2008 AMC 8 第 6 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。
6.
图中阴影正方形的面积与非阴影正方形的面积之比是多少?
In the figure, what is the ratio of the area of the shaded squares to the area of the unshaded squares?
小提示:
把中央的阴影正方形划分成与其他小正方形同样大小的单位块
Subdivide the central shaded square into unit-size pieces matching the others.
大提示:
统计阴影和非阴影的小正方形个数
Count shaded and unshaded equal-area small squares.
解答:
把中央阴影正方形细分后,图中共有 个相等的小正方形。
其中 个是阴影, 个不是阴影,所以所求比值为 。
所以正确答案是 D。
After subdividing the central shaded square, the figure has equal small squares.
Of these, are shaded and are unshaded, so the desired ratio is .
Thus, D is the correct answer.
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