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标题: Prep 2-140 请教,谢谢~~ [打印本页]

作者: ruhudisbfks    时间: 2008-4-23 07:12     标题: Prep 2-140 请教,谢谢~~

140. 

A manufacturer produced x percent more video cameras in 1994 than in 1993 and y percent more video cameras in 1995 than in 1994.  If the manufacturer produced 1,000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995 ?

(1) xy=20

(2) x+y +xy/100=9.2

答案是B.

但是我怎么觉得光第二的条件算不出来呢?

式子应该是:1000(1+x) (1+y)=1000(1+xy+x+y)

请大家帮我看看吧,是不是我脑子锈住了??

谢谢!!


作者: summervivien    时间: 2008-4-23 19:35

式子应该是:1000(1+X/100)*(1+Y/100)

LZ错把X理解成最终的百分比了。


作者: ruhudisbfks    时间: 2008-4-25 19:56

哦,我明白了,真是太感谢了!~




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