(1-2X)^9．(1+1/X)^3
求展開式的常數項
a-maths問題...急
2008-10-08 9:35 am
回答 (2)
2008-10-09 2:25 am
2008-10-08 5:35 pm
={1+18X+144X^2+672X^3+2016X^4+4032X^5+5376X^6+4608X^7+2304X^8+512X^9}.{1+3X^-1+3X^-2+1)
=3X^-2+3X^-1+2484X+8350X^2+19486X^3+32256X^4+38016X^5+31488X^6+17664X^7+6144X^8+1024^9+488
.............
我無氣...邊個呀sir出!!
無論對錯
記住多謝我!!!
2008-10-08 10:24:06 補充：
THAT's wrong..
ANSWER:
X^-3+21X^-2+57X^-1+4482X+12238X^2+24190X^3
+34848X^4+36288X^5+26624X^6+13056X^7+3840X^8+512X^9+1159
=3X^-2+3X^-1+2484X+8350X^2+19486X^3+32256X^4+38016X^5+31488X^6+17664X^7+6144X^8+1024^9+488
.............
我無氣...邊個呀sir出!!
無論對錯
記住多謝我!!!
2008-10-08 10:24:06 補充：
THAT's wrong..
ANSWER:
X^-3+21X^-2+57X^-1+4482X+12238X^2+24190X^3
+34848X^4+36288X^5+26624X^6+13056X^7+3840X^8+512X^9+1159
參考: 自已 tired, 自已
收錄日期: 2021-04-23 20:35:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081008000051KK00189