請問有冇人識得計以下幾題奧數題目?

2007-09-19 1:13 am
1.(2^2+4^2+...+2006^2)-(1^2+3^2+...+2005^2)/(2+4+...+2006)(1+3+...+2005)
2.若x+1/x=5,求x^2/x^4+x^2+1
3.化簡〔7+2(1+√3)(1+√5)〕的開方(成舊)
4.〔(2+1)(2^2+1)(2^3+1)...(2^64+1)+1〕的開方
5.以知a=999X998998999,b=999999998,求a-b
6.因式分解a^2-b^2+4a+2b+3

回答 (2)

2007-11-29 2:56 am
2.x^2+1/x^2+2-1=(x+1/x)^2-1=25-1=24
6. a^2-b^2+4a+2b+3=(a+b)(a-b)+4a+2b+3
=(a+b+1)(a-b+3)
3. (9+2(3)^(1/2)+2(5)^(1/2)+2(15)^(1/2))^(1/2)
=(1+3+5+2(3)^(1/2)+2(5)^(1/2)+2(15)^(1/2))^(1/2)
=((1+(3)^(1/2)+(5)^(1/2))^2)^(1/2)
=1+(3)^(1/2)+(5)^(1/2
2007-09-19 4:51 am
第一題係咪
[4014/2008x2006x1003]?

2007-09-18 21:01:08 補充:
係.[(2^2+4^2+...+2006^2)-(1^2+3^2+...+2005^2)] / 2+4+...+2006)(1+3+...+2005)or.(2^2+4^2+...+2006^2) - [(1^2+3^2+...+2005^2)/(2+4+...+2006)(1+3+...+2005)]

2007-09-22 09:04:48 補充:
我計到:4014/[2008x2006x1003]right~?你有冇ans~我都想知岩唔岩~


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