几道7/17数学JJ 基本确定答案(M51)

Liu_leaf · 发表于 2009-7-18 23:37:00

以下是引用fujialei在2009/7/18 19:19:00的发言：

谢谢楼主啊，好详细！

PS--An=c*A(n-1) c为常数 A8=-1/8 A7=1/4 （数不一定对）求A1

算出常数为-1/2倒退即可，答案好像是16还是32（忘了）

这道题应该是16对吧？

S--一个四边形quadrilateral，问是否是平行四边形parallelogram

1）两条边长分别为7

2）对立的两条边长分别为3 The opposite of the two sides are 3

这道题可能选c吧，两对边7，两对边3哦。就是平行四边形吧。

我也觉得应该选c，平行四边形的判定有一个是两组对边分别相等，原文说了一组是对边为3，为7的那组也只能是对遍了

同意

tyion · 发表于 2009-7-19 08:38:00

"the opposite of the two sides are 3", we should therefore make clear the term "the two sides" stands for which of the following:1.the two sides mentioned in the first condition, or 2.the two sides mentioned in the second condition. Since it is a Data Sufficiency problem, the two conditions given should not inherently overlap, which here means we can only choose 2.Condition2 consists of 2 sentences,notice that the one in Chinese bears a different meaning from the one in English!!

IMO B, not C or E.

几道7/17数学JJ 基本确定答案(M51)

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