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最新题目

题目内容

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纠错
In June 1990, a small academic press published an initial run of 2,500 copies of linguist Chloe Vermeulen’s first book, Speech and Speaking. Because the first run was selling well, a second, larger run was produced in June 1995. Total sales for the period from June 1995–June 2000 represented an increase of 52 percent over total sales for the preceding five years; by June 2000, Vermeulen’s book had sold a total of 3,843 copies. In 2000, Speech and Speaking was cited in an influential paper; subsequently, for the period June 2000–June 2005, sales of Vermeulen’s book were double the sales for the previous five-year period.In the table, identify the number of books that most closely approximates the total sales of Speech and Speaking for each of the five-year periods June 1990–June 1995 and June 2000–June 2005, based on the information given. Make only two selections, one in each column.

June 1990–June 1995 June 2000–June 2005
1320
1320
1320
1530
1530
1530
2530
2530
2530
2640
2640
2640
3800
3800
3800
4640
4640
4640
正确答案: 2,6

参考解析

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    知识点概述
    本题主要涉及数据关系分析和简单的数学计算(百分比计算和倍数关系),从给定的书籍销售数据及变化关系中得出不同时间段的销售数量。 解析
    设1990 - 1995年的销售数量为\(x\)。已知1995 - 2000年总销量比前五年增长\(52\%\),且到2000年总销量为\(3843\)本,则可列方程\(x + 1.52x=3843\),解得\(x=\frac{3843}{2.52}\approx1530\)本。2000 - 2005年销量是1995 - 2000年的两倍,1995 - 2000年销量为\(1.52\times1530\approx2326\)本,所以2000 - 2005年销量约为\(2\times2326 = 4652\),最接近\(4640\)本。所以1990 - 1995年选\(1530\),2000 - 2005年选\(4640\)。

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