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201*пһģģԇ}12}Y(ji)һ
һ
һKҎ(gu)}
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S1S2S3S4
tһɫεeS1^DеҎ(gu)n(n(sh))ɫεeSn
149162ɽ^(q)12һMҎ(gu)еʽӣ2,5,8,11,...(a0)е8
aaaaʽnʽǣn(sh)
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ADϾcAnȷcn2n(sh)
tEF=únabʽӱʾ
201*пһģģԇ}12}Y(ji)
һKҎ(gu)}
5T^ϡ12.DԵAOBб߅ֱ߅
2ֱABA1ԵֱABA1б߅ֱ߅3ֱA1BB1ȥOAOB1tnֱεeSn________n(sh).
B2A1AOBB1
6S_^(q)12ƽֱϵУMv˶
(sh)cQcՈ^DA1B1C1D1A2B2C2D2A3B3C3D3ÿėl߅ϵcĂ(sh)Ҏ(gu)A10B10C10D10ėl߅ϵcЂ
7ͨ݅^(q)12ijЩֲl(f)ѿ@һNҎ(gu)ɣl(f)ѿڶ
겻l(f)ѿѿԺÿ궼l(f)ѿ.l(f)ѿҎ(gu)Ҋ±Oһǰѿ(sh)anѿѿʿѿ1a0a2aa2a32aa3a43a2a5a55a3a8a@ȥ8ѿ(sh)cѿ(sh)ıֵ.
8ꖅ^(q)12DABCACB=90AC=BC=1ȡб߅cб߅
һµĵֱΣ^m(x)ȥֱֱεб߅cABCBC߅دBֹ˕r@εб߅L_____
9ƽ^(q)12^ЈD
1D2D201*пһģģԇ}12}Y(ji)
һKҎ(gu)}
3D
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10^(q)12.Dn+1߅L2ĵ߅һl߅ͬһֱO
B2D1C1eS1B3D2C2eS2Bn1DnCneSnt
S2=Sn=____únʽӱʾ
11ɽ^(q)12.D24߅L1СνMɵľW(wng)cP
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12ƽȅ^(q)12.DABCA=96DBCLϵһc,
ABCcACD(ACB)ƽ־A1ctA1=A
BAA1A2CDϵķBA2C,BA3CBAnC(n(sh))tAnȣúĴ(sh)ʽʾ.
13S_^(q)12D߅L1ABCDDAB60㣮(lin)Y(ji)ǾAC
AC߅ڶACC1D1ʹD1AC60(lin)Y(ji)AC1AC1߅AC1C2D2ʹD2AC160㣬Ҏ(gu)ĵnε߅L___________
DD1DA
BC1C
C2201*пһģģԇ}12}Y(ji)
һKҎ(gu)}
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c˷քeA11B21C21D11ySһcP02@cAD(zhun)180cP1cP1@cBD(zhun)180cP2cP2@cC
D(zhun)180cP3tcP3ǣ,
15Dž^(q)12һMҎ(gu)е(sh)5711196(sh)_____
(j)Ҏ(gu)n(sh)____n(sh).
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1İAõDP2ȻμȥһСİAֱǰһ2Aİ돽ÈDP3,P4,,Pn,ӛPneSn
ԇӋS3S2õSnSn1n2
P1P2
12}D
P32......a5a8a1117T^ϡ12.һMһҎ(gu)еʽӣaa0,
234tnʽ
ǣn(sh)
18|Dž^(q)12.DOA1B1C1߅L2OAOA1돽
A1C1OB1cB2OA1C1c߅A1B1B1C1ɵӰeS1ȻOB2錦ǾOA2B2C2OAOA2돽A2C2OB2cB3OA2C2c߅A2B2B2C2ɵӰeS2Ҏ(gu)^m(x)ȥOAnCnc߅AnBnBnCnɵӰeSnt
201*пһģģԇ}12}Y(ji)
һKҎ(gu)}
S1Sn.
12}D
19ʯɽ12.Ҏ(gu)mʾmС(sh){
1mʾm(sh)[
5}=3{5}=6{1.3}=27]=3[4]=4[1.5]=22(sh)xMP(gun)ϵʽ:2x3x12tx__________.
20Dž^(q)12ƽֱϵ҂
Q߅L1cęMv˾(sh)ΞλcΣDABCDУĂc˷քeǣ8,00,48,0
A04tABCDܸwĆλc
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nܸwĆλcεĂ(sh)飨únʽӱʾ.
y4BCO-48x
D201*пһģģԇ}12}Y(ji)
һKҎ(gu)}
ʾP(gun)ڡ201*Y(ji)oķHչ˼Sʹ201*Y(ji)ԓƪ½h(chung)
ԴW(wng)j ؟ăHތWa(chn)(qun)}Ո(lin)ϵ҂rh