太绕了，把我弄糊涂了，那位帮忙翻译成中文？

ubcsong

If martin introduces an amendment to Evans's bill,then Johnson and Lloyd will both vote the same way.If Evans speaks against Lloyd's position,Johnson will defend anyone voting with him. Martin will introduce an amendment to Evans's bill only if Evans speaks against Johnson's position.


If the above statement     are ture,each of the following can be ture EXCEPT


A) If Evans speaks against Johnson's position,Lloyd will not vote with Johnson.


B) If martin introduces an amendment to Evans's bill,then Evans has spoken against Johnson's position.


C)If    Evans speaks against Johnson's position,    Martin will not introduce an amendment to Evans's bill.


D)If martin introduces an amendment to Evans's bill,then either Johnson will not vote with Lloyd or Evans did not speak against Johnson's position.


E) If either Evans did not speak against Lloyd's position or Martin did not introduce an amendment to Evans's bill,then either Johnson did not defend Lloyd or Martin spoke against Johnson's position.

weiyu

这种题的关键不是翻译, 关键是逻辑结构. 否则翻译了你还是没用.


将一种逻辑表达方法吧. A,B互斥记为: A/B(比如A反对B, 也可以记作A/B); AB同性记为: AB


看看原文逻辑:


M/E->JL;     E/L->JX(X只J的同性元素); M/E->E/J


所以推出M/E->E/(JL)->JX


根据上面的推理只有D是答案. 不知对否. 请指教

snow_mountain

解这种题目的关键不是翻译，而是画关系图。一个答案一个答案的对。

snow_mountain

呵呵。意见相同嘛。同意D。只有D是肯定不对。

ubcsong

谢谢各位，答案是D,可一个个答案对比台浪费时间了

freedownload

请教weiyu,我觉得你的方法是很好，但我还是没有看得懂，能否请你解释详细一点

M/E->JL;  E/L->JX(X只J的同性元素); M/E->E/J，这一步，我明白

所以推出M/E->E/(JL)->JX，这一步，我就不明白了，而且，用你的这个结论怎么去得出a)选项，能否示范一下。

我很想掌握这种方法，谢谢！

weiyu

以下是引用weiyu在2004-3-30 16:56:00的发言：
这种题的关键不是翻译, 关键是逻辑结构. 否则翻译了你还是没用.
将一种逻辑表达方法吧. A,B互斥记为: A/B(比如A反对B, 也可以记作A/B); AB同性记为: AB
看看原文逻辑:
M/E->JL;     E/L->JX(X只J的同性元素); M/E->E/J
所以推出M/E->E/(JL)->JX
根据上面的推理只有D是答案. 不知对否. 请指教

M/E->E/J +M/E->JL;得到M/E->E/(JL)

E/(JL)就是E/L的子集->JX