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A proposed change to federal income tax laws would eliminate deductions from taxable income for donations ataxpayer has made to charitable and educational institutions. If this change were adopted, wealthy individualswould no longer be permitted such deductions. Therefore, many charitable and educational institutions wouldhave to reduce services, and some would have to close their doors.

The argument above assumes which of the following?

正确答案: A

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假设题如何取非

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楼主
发表于 2004-11-4 04:30:00 | 只看该作者

假设题如何取非

取非意思就是假如某个选项是的。

大体有三种情况:

1. all----not all/some---none/always----not always/sometimes----never/everywhere---not everywhere/somewhere---nowhere/only one, exactly one---none, more than one/at least one, some---none

2. 对于选项为条件句,将必要条件取非。

3. 直接将谓语肯定变否定,或否定变肯定。

[此贴子已经被作者于2004-11-4 4:32:38编辑过]
推荐
发表于 2005-8-9 23:11:00 | 只看该作者

好贴!


沙发
发表于 2004-11-4 08:42:00 | 只看该作者
谢谢lawyer
板凳
发表于 2004-11-5 14:16:00 | 只看该作者
地板
发表于 2004-11-9 08:25:00 | 只看该作者

能对第二点举个例子吗。

谢谢了。

5#
 楼主| 发表于 2004-11-9 08:47:00 | 只看该作者

if you  get a high score of GMAT, you will be accepted by Harvard University.

取非为:if you  get a high score of GMAT, you will NOT be accepted by Harvard University

6#
发表于 2004-11-10 08:37:00 | 只看该作者
好贴!!!我还正准备问条件句怎么取非呢, 这回懂了!
7#
发表于 2004-11-10 10:06:00 | 只看该作者

搞定了。谢谢

8#
发表于 2005-3-23 23:12:00 | 只看该作者

p->q这个判断(有的称之为命题)从formal logic(形式逻辑)来说,应该是P且~q


if you  get a high score of GMAT, you will be accepted by Harvard University.


It is not the case that if you  get a high score of GMAT, you will be accepted by Harvard University.<=> You get a high score of GMAT and You won't be accepted by Harvard University.


这里的很多说法都和逻辑不同,我补充一下正确的逻辑取非是什么样子的:


~(p或q) <=>(~p)且(~q)


~(p->q)<=>p且~q


~(p且q)<=>(~p)或(~q)


~(p<->q)<=>(p且~q)或(~p且q)


[此贴子已经被作者于2005-3-23 23:16:42编辑过]
9#
发表于 2005-8-9 22:36:00 | 只看该作者
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