标题: Two Data Sufficient [打印本页] 作者: lisaislisa 时间: 2002-11-19 22:33 标题: Two Data Sufficient
[em18][em08][em18][em08][em18][em08][em18][em08]
If both X&Y are nonzero integers , what is Y/X ?
1)X=6
2)Y^2/X^2=1
the An is E but MINE is (B)
since Y^2/X^2=1 then Y/X = +-1 as Yand X , obviously two different numbers so Y/X can not be 1 then it is -1
so do I misunderstand ? X and Y sign for different numbers ?
[em06][em27][em06][em27][em06][em27]作者: lisaislisa 时间: 2002-11-19 22:40
another problem goes like this ...
In rectangular coordinate system , is (r,s) and (u,v) equidistant from the origin ?
1)r+s=1
2)u=1-r and r=1-s
the An is C but MINE is (E)
from the both of the two prerequisites we get r+s=1 and u+v=1 means (r,s) and (u,v) are both in the line x+y=1
but to get the result ,r^2 +s^2=u^2+v^2 is required , isn't it ?
THANK U ^^作者: tongxun 时间: 2002-11-20 00:21
你的两个答案都是对的。B、E。作者: daydream 时间: 2002-11-20 03:34
In rectangular coordinate system , is (r,s) and (u,v) equidistant from the origin ?
1)r+s=1
2)u=1-r and v=1-s
the An is C but MINE is (E)
--------------------------------
由(2): u^2+v^2=(1-r)^2+(1-s)^2 = r^2+s^2-2(r+s)+2
由(1): r+s=1 ==> u^2+v^2= r^2+s^2
所以答案为: C作者: bill_cheung 时间: 2002-11-20 09:18
the first one
it is never mentioned that X and Y represent different figures.
so the answer still should be E.作者: kanecao 时间: 2002-11-20 10:54
THE FIRST ONE:
If both X&Y are nonzero integers , what is Y/X ?
1)X=6; 2)Y^2/X^2=1
thank you daydream ^^ it's an interesting problem !
and about my first question
when there are different letters , it doesn't mean 'different' numbers ?
there is a rule , right ?
good luck to all ^^作者: 陈月麟 时间: 2002-11-24 16:01
lisalisa,
The second question. I think we cannot answer this question because we do not know where the origin is.
请问我的思路有错吗？
谢谢！作者: lisaislisa 时间: 2002-11-26 22:15
to LinLin :
we don't know where it origin is ? I am a bit confussing .
I suppose origin means the point (0,0) , isn't it ...
from LIsa ^^
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/)
