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(,324000):2006-12-19:2006-12-28()..11ABCD-A1B1C1D1ABBCEF,45.().(A)(B)(C)(D)()1:1,,EFBB1,.D1,tan=tanD1GD=2231.45.A1C1,tan=tanO1GO=221.45.,A1D1D1C1(),.(B).:,.DD1,;A1D1D1C1(),;A1B1B1C1(B1),.222,AB2BCCD,AD.PQRABBCCD,AP=5,PB=15,BQ=15,CR=10.,PQR?(16):BP=BQ,,PQAC.,RPQAFU,AU=CR.RPQPQR,,U.UR,.,PQRU2.UR=202,PQ=152,PU=55.520073(UR+PQ)PU2-UR-PQ22=3522252=525.:,PQR,.3.1ABCD-A1B1C1D1,EAB,FCC1.D1EF().(A)112(25+213+95)(B)112(15+413+95)(C)112(25+213+65)(D)112(15+413+65)():,,.:;.31:3,D1FDCP,EPBCN,DAS,D1SA1AM,D1MENF.A1M=3MA,CN=2NB.D1MENF112(25+213+95).(A).42:4,EMA1SD1FA1AM(SB1B),FNC1TD1MBCN(BT=AM),D1MENF.1(A).34P-ABCD,,.().(A)(B)(C)(D)(2005,)5:5,BACDM,PM,PMPABPCD.,PNPADPBC.PMPN.,(5A1B1C1D1).,.(D).5ABCDA,BCD75..():1.AAOBCDO,AO=63.O663cot75BCD.BCD,BCD.BCD,AMN,6.6CB1=DC1,B1C1(6),AB1C1,6.BE,CDE.BCEACE,BE=AE,ABE,6.,18.:,,.4767,ABCD-A1B1C1D1.AC1,.S,l.().(A)S,l(B)Sl(C)S,l(D)Sl(2005,):.1.7,EFGHIJ,,EFGHIJ,l1=32,S1=334.A1BD,l2=32,S2=32.l1=l2,S1S2,S,l..J1E1F1G1H1I1,.,J1E1D1B1=A1E1A1B1,E1F1A1B=B1E1A1B1.,J1E1=2A1E1,E1F1=2B1E1,J1E1+E1F1=2(A1E1+B1E1)=2A1B1=2.,22.,J1E1F1G1H1I132.(C).:,.578,ABCD8,AB=CD=a,AC=BD=b,AD=BC=c,ABBCCDDAPQRS.PQRS().(A)2a(B)2b(C)2c(D)a+b+c():9,.,7200739AB=CD,AC=BD,AD=BC,,ADBCAD,ABCD,,AADD,ACA,DBD,AA=DD=2BD.PQRSSPQRS(SS),,PQRSS,SP+PQ+QR+RS,PQRS.SA=SA,,l=SS=DD=2BD=2b.(B).:,.8ABCD-A1B1C1D1,AB=a,BC=b,CC1=c(abc).BD1S.S,S().():(,),.:(1)ABC1D1BCD1A1DBB1D1,S1S2S3,S1=ab2+c2,S2=bc2+a2,S3=ca2+b2.abc,S1S2S3.DBB1D1.(2),10(a)(b)(c)(BED1FBPD1QBRD1S),S4S5S6.10BED1F,EHBD1H(10(a)),S4=EHBD1.BD1,,EH,S4S4.EHBD1AA1,,A1DBB1D1,RtA1B1D1B1D1aba2+b2.S4=aba2+b2a2+b2+c2.,S5=aca2+c2a2+b2+c2,S6=bcc2+b2a2+b2+c2.S4S5S6S6S3.BRD1S,bcb2+c2a2+b2+c2.,B1R=OG=ac2b2+c2(10(d)).1.:;;;;.().(A)(B)(C)(D)811(2005,)(:,;,,;,,;,.:(B).)2.ABCD2,().(A)4(B)3(C)3(D)3+3(2003,)(::(1)1,3,4;(2)2,3.:(D).)3.ABCD-A1B1C1D1BD1S,S1S2S.S1S2().(A)32(B)62(C)233(D)263(2004,)(:(C).)4.:.(18)(:.,,,.,,p32a,S12pa2324a2a2.)5.11,S-ABCDOABCD,AB=4,AD=12,SA=3,SB=5,SO=7.SOBCN.BN,SMN??(1996,())(:SAABCD.OM=ON,SSMN=2SSMO.,MSOABSO,SSMO.,SSMO=421313,BN=71113.)(,410081):2006-09-07:2006-12-26[1](HÊlder):{ai},{bi},,{li}(i=1,2,,n),,,,,=-(++)1,n2,ni=1aibili(ni=1ai)n-1(ni=1bi)(ni=1li).,=1,,1,.,n2=m+1,=m(m0)=-m,=-(m+1)(m-1),.:ai0,bi0(i=1,2,,n),m0m-1,920073