Problem with Math JJ 366

systemunknow · 发表于 2006-9-23 03:32:00

New

[此贴子已经被作者于2008-7-22 5:48:29编辑过]

whatapain · 发表于 2006-9-23 04:18:00

u a right

x + 1/x always >=2 (when x>0)

sjseido · 发表于 2006-9-23 04:42:00

以下是引用systemunknow在2006-9-23 3:32:00的发言：

lol nvm didn't read the end of the question

Agree, the answer should be E.

systemunknow · 发表于 2006-9-23 05:05:00

Actually, the answer should be A... Here is why...

366.DS：x>o,x+1/X大于等于y?

1)y等于2

2）x小于5

我选A

Okay remember the question said 大于等于 which means that x + 1/x >= Y?

When 1) y=2 and we have x = 1 we have 1 + 1/1 = 2 which = to Y and when x = 2 we have 2 + 1/2 = 2 1/2 which is > than Y.

2) doesn't stand

So A actually DO fit into the condition x + 1/x >= 2 and the answer is Yes, it does. so the answer should be A which JJ poster was right on the money

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