Sn=1-5+9-13+17-21+……+(-1)^n-1(4n-3),求Sn?当n为奇数时,Sn=-4(n-1)/2 +4n-3=2n-1这是怎么来的?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 10:51:47
![Sn=1-5+9-13+17-21+……+(-1)^n-1(4n-3),求Sn?当n为奇数时,Sn=-4(n-1)/2 +4n-3=2n-1这是怎么来的?](/uploads/image/z/2730323-11-3.jpg?t=Sn%3D1-5%2B9-13%2B17-21%2B%E2%80%A6%E2%80%A6%2B%28-1%29%5En-1%284n-3%29%2C%E6%B1%82Sn%3F%E5%BD%93n%E4%B8%BA%E5%A5%87%E6%95%B0%E6%97%B6%2CSn%3D-4%28n-1%29%2F2+%2B4n-3%3D2n-1%E8%BF%99%E6%98%AF%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84%3F)
xX]oI+ytJIG(#%3/hqRi6`ƀtUW?/UMn>6Bֹ{o>qmg/ڿ}V?o+Wy/liCv]^[v
=_[棥oq'fõcGgfi7z[]rc~>{>'+װk|-}[y%ncF:<8q{}4Ï,Vew]S]ձ{}U(Guol^F67-M+`_^Ot._,~/zo a߿v5\}?_[wȃ
§?9Ъ뛏:90mCOz7-Y,jVYob>*8ռ18>.ّ8ưZ %D'nƤf4jx9̝.k1?2+c\'l18(q?P`o}D.NC*qnV/gX+F,l&fJ-Mͭ}5sP֬hF1FRAmY* ]~k0SULqN-9֟#9l*T~oi:00/^x,,Ҳ-˳tlfI%Al1Qьi#0KvAlfli55-vV 5qw*VrAanwXkg^@b#GHXOQ 6E v9=Hn͑k~fĜdвꄬ3uu1`/ߟqص$ߘC{8T{$wE3Y] 3EեxK]:!6! +~} Wci%%p͆}&-#)(}
Y_x|+:2J Z:r){eGN@2V'xQnT"N7_iPhI:4F`7G,U%|!f۬P.th)mڬY=<xyaٲzcrEXc >R-gXRjOk+- мL1oF^`Cӹ[dnQUdYqT[w
FP9`4.э3IAD>Uy:Qz7J{S^%I&HB<aU'KIJT-F/D 4<c@{ˢW^.9HNbW/Xm(S%JtJދH ͞~X`&:4ZKe~%yȓ54FQe:t(KI˓I"үXE ̚#/t:1=lNrzUX1K\DYtFT'a%=u-| *;*)uz^(JKljdQ-p3qWk{JyRŃYkz/c;ѠiسK]nNpq#uz=0;LZoeN*baWe<\Q{1(0}czꭶT0=` >ׇⶫl%zwpIAWQOؾY諊