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1、数列的求和一、教学目标:1熟练掌握等差数列与等比数列的求和公式;2能运用倒序相加、错位相减、拆项相消等重要的数学方法进行求和运算;3熟记一些常用的数列的和的公式二、教学重点:特殊数列求和的方法三、教学过程:(一)主要知识:1直接法:即直接用等差、等比数列的求和公式求和。(1)等差数列的求和公式:dnnnaaanSnn2)1(2)(11(2)等比数列的求和公式)1(1)1()1(11qqqaqnaSnn(切记:公比含字母时一定要讨论)2公式法:222221(1)(21)1236nkn nnkn2333331(1)1232nkn nkn3错位相减法:比如.,2211的和求等比等差nnnnbabab
2、aba4裂项相消法:把数列的通项拆成两项之差、正负相消剩下首尾若干项。常见拆项公式:111)1(1nnnn;1111()(2)22n nnn)121121(21)12)(12(1nnnn!)!1(!nnnn5分组求和法:把数列的每一项分成若干项,使其转化为等差或等比数列,再求和。6合并求和法:如求22222212979899100的和。7倒序相加法:8其它求和法:如归纳猜想法,奇偶法等(二)主要方法:1求数列的和注意方法的选取:关键是看数列的通项公式;2求和过程中注意分类讨论思想的运用;3转化思想的运用;(三)例题分析:例 1求和:个nnS11111111122222)1()1()1(nnnx
3、xxxxxS求数列1,3+4,5+6+7,7+8+9+10,前 n 项和nS思路分析:通过分组,直接用公式求和。解:)110(9110101011112kkkka个)101010(91)110()110()110(9122nSnnn81109109)110(10911nnnn)21()21()21(224422nnnxxxxxxSnxxxxxxnn2)111()(242242(1)当1x时,nxxxxnxxxxxxSnnnnnn2)1()1)(1(21)1(1)1(22222222222(2)当nSxn4,1时kkkkkkkkkkak23252)23()12()1()12()12(2)12(2
4、2)1(236)12)(1(25)21(23)21(2522221nnnnnnnaaaSnn)25)(1(61nnn总结:运用等比数列前n 项和公式时,要注意公比11qq或讨论。2错位相减法求和例 2已知数列)0()12(,5,3,112aanaan,求前 n项和。思路分析:已知数列各项是等差数列1,3,5,2n-1 与等比数列120,naaaa对应项积,可用错位相减法求和。解:1)12(53112nnanaaS2)12(5332nnanaaaaSnnnanaaaaSa)12(22221)1(:21132当nnnnaaaSaa)12()1()1(21)1(,121时21)1()12()12(1
5、aananaSnnn当2,1nSan时3.裂项相消法求和例 3.求和)12)(12()2(534312222nnnSn思路分析:分式求和可用裂项相消法求和.解:)121121(211)12)(12(11)12)(12(11)2()12)(12()2(22kkkkkkkkkkak12)1(2)1211(21)121121()5131()311(2121nnnnnnnnaaaSnn练 习:文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2
6、B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2
7、U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C
8、2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4
9、L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10
10、A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR
11、3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9
12、X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6求nnanaaaS32321答案:)1()1()1()1()1(2)1(2aaaanaaannSnnn4.倒序相加法求和例 4 求证:nnnnnnnCnCCC2)1()12(53210思路分析:由mnnmnCC可用倒序相加法求和。证:令)1()12(53210nnnnnnCnCCCS则)2(35)12()12(0121nnnnnnnnCCCCnCnSmnnmnCCnnnnnnCnCnCnCnS)22()22()22()22(2:)2()1(210有nnnnnnnnCCCC
13、nS2)1()1(210等式成立5其它求和方法还可用归纳猜想法,奇偶法等方法求和。例 5已知数列nnnnSnaa求,)1(2,。思路分析:nnna)1(22,通过分组,对n 分奇偶讨论求和。解:nnna)1(22,若mkkmnmSSmn212)1(2)2321(2,2则)1(2)12()2321(2nnmmmSn若)12(22)12()1(222)12(,1222212mmmmmmaSSSmnmmmmn则22)1()1(224222nnnnmm)(2)()1(2为正奇数为正偶数nnnnnnSn预备:已知nnnaaaaxaxaxaxf,)(321221且成等差数列,n 为正偶数,又nfnf)1(
14、,)1(2,试比较)21(f与 3 的大小。解:naaaaafnaaaafnnn13212321)1()1(2222)(121dnaandnnnaann12122)1(111naadndnaan文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8
15、G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J
16、3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2
17、B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2
18、U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C
19、2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4
20、L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6nnnfxnxxxxf)21)(12()21(5)21(321)21(
21、)12(53)(3232可求得nnnf)21)(12()21(3)21(2,n 为正偶数,3)21(f(四)巩固练习:1求下列数列的前n项和nS:(1)5,55,555,5555,5(101)9n,;(2)1111,1 3 24 3 5(2)n n;(3)11nann;(4)23,2,3,naaana;(5)1 3,24,35,(2),n n;(6)2222sin 1sin 2sin 3sin 89解:(1)555555555nnS个5(999999999)9n个235(101)(101)(101)(101)9n23550510101010(101)9819nnnn(2)11 11()(2)2
22、2n nnn,11111111(1)()()()2324352nSnn1111(1)2212nn(3)1111(1)(1)nnnannnnnnnn11121321nSnn(21)(32)(1)nn11n(4)2323nnSaaana,当1a时,123nS(1)2n nn,当1a时,2323nSaaanna,23423naSaaa1nna,两式相减得23(1)na Saaa11(1)1nnnnaaananaa,212(1)(1)nnnnanaaSa(5)2(2)2n nnn,原式222(1232)2(1 23n)n(1)(27)6n nn(6)设2222sin 1sin 2sin 3sin 89
23、S,又2222sin 89sin 88sin 87sin 1S,289S,892S2已知数列na的通项65()2()nnnnan为奇数为偶数,求其前n项和nS文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4
24、 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1
25、ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文
26、档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8
27、B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W
28、1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G
29、6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6解:奇数项组成以11a为首项,公差为12 的等差数列,偶数项组成以24a为首项,公比为4 的等比数列;当n
30、为奇数时,奇数项有12n项,偶数项有12n项,1121(1 65)4(1 4)(1)(32)4(21)221423nnnnnnnS,当n为偶数时,奇数项和偶数项分别有2n项,2(1 65)4(1 4)(32)4(21)221423nnnnnnnS,所以,1(1)(32)4(21)()23(32)4(21)()23nnnnnnSnnn为奇数为偶数四、小结:1掌握各种求和基本方法;2利用等比数列求和公式时注意分11qq或讨论。文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:
31、CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 H
32、G9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB
33、5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编
34、码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4
35、 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1
36、ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6文档编码:CR3C2J3K8B4 HG9X4L2B3W1 ZB5R10A2U8G6