問
a,b,c are constanta+b+c=0
(a^2)+(b^2)+(c^2)=1
(a^4)+(b^4)+(c^4)=? 咁似pure math d 問題既
a+b+c=0
(a+b+c)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc = 0
(a^2)+(b^2)+(c^2)=1
2ab + 2ac + 2bc = -1
ab + ac + bc = -1/2
(ab + ac + bc)^2 = 1/4
a^2b^2 + a^2c^2 + b^2c^2 + (a + b + c)abc = 1/4
a^2b^2 + a^2c^2 + b^2c^2 = 1/4
2(a^2b^2 + a^2c^2 + b^2c^2) = 1/2
(a^2 + b^2 + c^2)^2 = a^4 + b^4 + c^4 + 2a^2b^2 + 2b^2c^2 + 2a^2c^2
a^4 + b^4 + c^4 = 1 - 1/2 = 1/2 原帖由 【YU】 於 17-7-2008 21:02 發表 http://www.nakuz.com/bbs/images/common/back.gif
咁似pure math d 問題既
a+b+c=0
(a+b+c)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc = 0
(a^2)+(b^2)+(c^2)=1
2ab + 2ac + 2bc = -1
ab + ac + bc = -1/2
(ab + ac + bc)^2 = 1/4
a^2b^2 + a^2c^2 + b^2c^2 + ( ...
嘔血...你點樣諗出泥[] 原帖由 piyopiyo 於 17-7-2008 10:00 PM 發表 http://www4.nakuz.com/bbs/images/common/back.gif
嘔血...你點樣諗出泥[]
讀左pure 應該成日用到ne 類野
[] 唉...
我都想讀... 原帖由 L.K. 於 17-7-2008 11:29 PM 發表 http://www.nakuz.com/bbs/images/common/back.gif
唉...
我都想讀...
你要讀, 點都有得比你讀[] 原帖由 Zend 於 19-7-2008 19:44 發表 http://www.nakuz.com/bbs/images/common/back.gif
你要讀, 點都有得比你讀[]
唔係人人都好似你咁叻...我呢d人可謂前路茫茫 原帖由 piyopiyo 於 19-7-2008 07:57 PM 發表 http://www.nakuz.com/bbs/images/common/back.gif
唔係人人都好似你咁叻...我呢d人可謂前路茫茫
前面, 我唔係叻, 但要做一定可以, 只係你會唔會take risk
後面, 唔係人人都好似你要求高, 用6901 就mimimum choice , 我係maximum ge choice來的 原帖由 Zend 於 19-7-2008 21:20 發表 http://www.nakuz.com/bbs/images/common/back.gif
前面, 我唔係叻, 但要做一定可以, 只係你會唔會take risk
後面, 唔係人人都好似你要求高, 用6901 就mimimum choice , 我係maximum ge choice來的
Zend伯所言甚是[] 原帖由 piyopiyo 於 19-7-2008 09:27 PM 發表 http://www.nakuz.com/bbs/images/common/back.gif
Zend伯所言甚是[]
你自己問題je []
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