23.
If -4<x<7 and -6<y<3, which of the following specifies all the positive values of xy?
不好意思,忘了怎么解这种不等式了。
考gmat的到最后都发现数学其实都有取巧的办法,
这题,最小的positive当然是1,最大的: 比较-4*-6和3*7哪个大,得出24
结果:(1,24)
错了n人别笑,我现在常常胡说八道
upstair,i'd love to see previously discussed links if i had found them.
probably u have seen them,so if it's not hard to u please attach the links,thank u.
又错了,我说的是inte。的情况,如果不是inte,那么是(0,24]了
对不起,我还达不到你的水平,如果你能用基本的方法解,i would appreciate it.
顶自己一下。
You can find lots of discussion threads here. It might be worth downloading the regular GWD and running a text search to see which ones match with your TT questions
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=176560&page=1
As for how to search for existing discussion
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=128922&page=1
does regular GWD mean XY GWD? I am quite confused of different version of GWD.
http://forum.chasedream.com/dispbbs.asp?boardid=34&id=79881&star=1#712863
第 2 楼
That's generally the one you'll find in the discussions. If you decide to work off the TT one, it'll require some extra work to find the matching question numbers and search with those. Someone is working on a list of TT verse original GWD and will post it when he's done putting the list together.
有一点我想说的是,如果你总是想用“正规”的方法,而不打算考虑有没有简单直接的方法,那gmat数学你是不可能在75分钟内完成37题的。
举个例子,1^2+2^2+……+n^2,你认为正规的方法是什么呢,一个一个算?
anyway,我觉得简单是最美的,哈,对于数学以及其他都是这样,gmat考了是为了商学院,商学院是想知道你“算计”的本事,算计这个本事不能慢,一定要快……哈
我之前的回复其实是很正式的了,虽然我称之为“讨巧”,你仔细想想。如果实在想不明白,你需要补习一下中学数学基本的原理和概念,而不是马上做题。我一开始复习gmat数学,首先就把gmatprep上的数学review看了,然后根据review的内容,加看自己生疏了的中学数学内容。
agree with ur points and solving techniques,however, i still want to know the regular solution of such question.
除了那个方法外就只能画图了,这个图形好像是立体的,所以…………
最好的方法还是那个
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