2007 AMC 10A 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.

在 Euclid 高中,参加 AMC 10 的学生数在 20022002 年为 606020032003 年为 666620042004 年为 707020052005 年为 767620062006 年为 787820072007 年为 8585。哪两个连续年份之间的百分比增长最大?

At Euclid High School, the number of students taking the AMC 10 was 6060 in 2002,2002, 6666 in 2003,2003, 7070 in 2004,2004, 7676 in 2005,2005, 7878 in 2006,2006, and is 8585 in 2007.2007. Between what two consecutive years was there the largest percentage increase?

2002200220032003

20022002 and 20032003

2003200320042004

20032003 and 20042004

2004200420052005

20042004 and 20052005

2005200520062006

20052005 and 20062006

2006200620072007

20062006 and 20072007

答案:A
知识点:百分数分数
难度评级:960
解答:

2002200220032003,增长为 660=110=10%. \dfrac{6}{60} = \dfrac{1}{10} = 10\%.

其他增长率为 466\dfrac{4}{66}670\dfrac{6}{70}276\dfrac{2}{76}778\dfrac{7}{78},都小于 110\dfrac{1}{10}

所以最大百分比增长发生在 2002200220032003 之间。

所以正确答案是 A

From 20022002 to 2003,2003, the increase is 660=110=10%. \dfrac{6}{60} = \dfrac{1}{10} = 10\%.

The other increases are 466,\dfrac{4}{66}, 670,\dfrac{6}{70}, 276,\dfrac{2}{76}, and 778,\dfrac{7}{78}, each less than 110.\dfrac{1}{10}.

So the largest percentage increase was between 20022002 and 2003.2003.

Thus, the correct answer is A.

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