| 發布者 | 內容列 | il_mares
Not too shy to talk
註冊日: 2005-07-03
發表數: 30
|  範圍 |  | a,b,c,d均為實數,
且a+b+c+d=3,a^2+2(b^2)+3(c^2)+6(d^2)=5
求a的範圍? |
| | 2009-08-17 10:23 |  | crazytrquan
Quite a regular
註冊日: 2007-09-12
發表數: 44
| | Re: 範圍 | | 引文:
il_mares 寫道:
a,b,c,d均為實數,
且a+b+c+d=3,a^2+2(b^2)+3(c^2)+6(d^2)=5
求a的範圍?
b+c+d=3-a,2(b^2)+3(c^2)+6(d^2)=5-a^2
用柯西不等式可求
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| | 2009-08-17 11:22 |  |
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