IT IS GIVEN THAT THE COEFFICIENT OF X^2 IN THE EXPANSION OF (1-X)^N + (1+2X)^N IS 105, WHERE N IS A POSITIVE INTERGER, FIND THE VALUE OF N
個N點求?係咪只可以靠代D數入去??請賜教
仲有一條,
FIND THE COEFFICIENT OF X^4 IN THE EXPANSION OF (3/X +1)^7 (2-X)^6
THZ
F.4 BINOMIAL THEOREM
2011-02-11 3:57 am
回答 (1)
2011-02-11 4:29 am
✔ 最佳答案
As follows:圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/ScreenHunter_06Feb102028.gif
2011-02-10 21:26:17 補充：
第二題:
(3/x+1)^7的常數項*(2-x)^6的x^4項-->x^4項
(3/x+1)^7的(3/x)項*(2-x)^6的x^5項-->x^4項
(3/x+1)^7的(3/x)^2項*(2-x)^6的x^6項-->x^4項
收錄日期: 2021-04-22 00:52:16
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110210000051KK01494