偶笨,不会把图贴上来,就是新东方DS SECTION 9中的第23题,大家帮我看看吧,555......怎么觉得这题应该选E呢?
23. In the figure above, segments RS and TU represent two positions of the same ladder leaning against the side SV of a wall. The length of TV is how much greater than the length of RV?
(1) The length of TU is 10 meters. (2) The length of RV is 5 meters.作者: himba 时间: 2004-8-2 10:29
条件1。TV=10×sin45＝5根号2。RV=10×sin30=5
TV-RV=5倍根号2－5
条件2。RV＝5，SR=TU=10，TV=10×sin45＝5倍根号2
答案同上了啊。所以选D.
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