|
| Author |
Message |
|
Erica
Joined: 11 Aug 2004Posts: 11
|
|
Posted: Thu Mar 24, 2005 8:52 pm Post subject: +Maths+
|
|
|
|
1. 若xy>0, 且(x^2)y=2, 則xy+x^2的最小值等於______
2. (sinA)^4 (cosA)^2的最大值是_____, 此時sinA=_____,cosA=______
|
|
|
|
|
|
me
Frequent VisitorJoined: 12 Feb 2004Posts: 213
Location: Hong Kong
|
|
Posted: Fri Mar 25, 2005 12:04 am Post subject:
|
|
|
|
Use AM-GM.
|
|
|
|
|
|
|
|
All times are GMT + 8 Hours
|
|
| |
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
|