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dip so LrQ gioi thii'rr r'0i bau,lr:u !iinh
lrsc gii t)-cfit ducri dang irinl: hcc ci'c vr)ng
trr)n dfnh hudng c6 t{nr ir€n mdt rltt<rng thing
0 ulro t!'lrir('. NI6i r i,rrg lt'i,rr ditrlt huong tltrr.r,'
coi li nrilt t( di0nt > co hoiiirh il6 bing hoitnir dd
tim 6 tren D (sau l:hi di biin C thirnir rir6t t-ruc
ttla d0), c6 tung dQ bqrts bal ltiriii t'!ai sii ciia
vdug trdn (bil. kini: la dtrolg t,eu .'"r.rug tinr
tluqc rllnh h*6ug ngurrc chitlu kim ildng lrir r'::'.
I'i A.m trong trudng hgp nguqrc 14i)- iittoiing cicir
d gi&r hai.< iti'6m ) cir toa. 4S (or. b1) r.ir (or, I;2)
itugo eli6n ti I-,6i cdng th['r;
N{iLYflr Lli\rl 'r0Ari : ''
< r.ring tlirn dilh lrLr,'rng cir tiirtt 1rt'ri'i i) )i tiri
a rlrt uttg th:iug )'-li rrrr)l triir isl'rp til rir ,':i,' \ i,lll'
tron clinh hu,'rrrg-r ! ltr vrii urr)t I'rirg ilr)n r]inlr
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lrhep r'! iu i:(l cttnq Inf)t tallrl li ttr ,'lto 1t'trtic (l;'rirr
l,iry iiug niur trOn O) r'rli qLrr- rlric ldng lrai vdlg
tldn yi lrr ngtriclr'livi r:harr Liii i;h{rc.irrrring.
CrLtiii liri'b{o rlri ltli cri tltl n,glii barr tltr: hitv
ti.rit-linr' mr)l r ii ngiri.)n ,:ritr niio irlri,. S:rrr ,1ri\i
tfri hhl,rr{ rhi tlr',rrrj gi tli'ir "j,'rl,'iii rrslriirr t'riri
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lihiLr il'0 gui -i lrlri tlr.rc citclr lri rrrinlr ti*i '{ t&i tar i rr
r';, lrsiltiirt { t'rl, " l;\ ri'i $.
t)i Ii! ngni.rt,-'tia: I'1.,r Iir;1 ttrl,i,tl ('ltll \c;11
lrr virirg tt'irn tlfnll litt'<'vrtg.1, li, {-.'nirlr ti1} niin
lhi tr.rri nOn u:0t tam giiit .4 lJ{.' iLl(ifip.'r;til ii I i
.\',1hiett rtiu .
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tty lheo hai t'dng tI'iru ngtrrrc ltrt',ing IIrry cling..
hudng. 1'a *tag {ta flriiy t'dtrg ntju (ilitrn> lih
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n6i t.'hiiirg )) n:i\ clti rmii iiLrqg ri$n gi': ', tr0ng- N0n
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,''ir:lt l;r,llr ''hrrrltr r';i tt tlC itlttt sntr :
, gn[ {{)c Dtng {'i{t ll \(i:t.r t lltl.r(ir t'tr-
'Ciin ctr \':\o (l), tl r:dltirb qqhi rilng tron.q iririli
hr,rl lrir.r'. iliic il-rmg cho tam giirc'i tiiing li tirrli
.nfr ' ltnt'' piii'rnng :t4nir hrrj'0n Jrirng liir''tr l;illr
1;irircrug llai Er?nh gdc vtr0ng', lllt-v. rtrji htdt rirch
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t < g/re )} iri lrin aii' ir',j thlnir : lghii'n citu cllc
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p 1,iri nlrrLr:
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C theo thti tLt' Jr&i c;ic rlitnr A', B', C', theo thir
tlr c(r io:r dd l-)€.cnl tl0tg thtrting lir (01, az),
{bt, bil, (d, ce) rrhrr .ir lr:inh 1', thi hei clrr0ng
thing -{?' vi,f i-' tto rtsn nrOi gdrc cii m6t phin
gihc sorrrl sollg v,ir Plr;'r n qi,ic llrri'rrhit.
.li6l rlair lltn .diiv t1,,,,, i,i'i-i sinh ra l mrii.: Ta
biEu dii'ru nr6i r-r.;nS Lrirn ilinir Lrr6ng t-o lirnt tr'0n D
cri tr;rr riq rr., rl) LiLng di}.irr c6 l.oa ri<; te-. y) trone
nrol h,.) torr r'15 I]0i::ic vurlrtr.l gi,c nrii li i;\ lnl,': r:
nirir i:ri-v niSi vi,ng 1l i,n tl jnir hrrdng iilrcYt llilir
ililn Livi dit'nr rlur, rri:dt h::..'' tirr'iP nhdt (g'ii ilidt
l) ninr ngane) {:rii:t lli, tirl iheo hrL,'tnqrirlr nti lr'r
nguoc Lri-v tirqiirr chiirrr liini dtlne I:d. Lr'rc t16 thi
nr6i < duunQ thi-ing > (rnli i-rip licp -"r)ng ir'--rn tlinh
huong) sE.itrr.rrt bi'brr cliin bilii rrrdt drrring thing
tht)ng lthrrring vi r'i,r ri i":m bi&u rli6n cic tong
lrr)n il[ri r! tu tiri rthr.tr lrorg nlrIng phell r.i til
,'riilg t,1itr. l:ifii'(.altir'i1)i: thii'rg > Ytl6lrg 96c sE ilunc
liBri' tlion !:iii iuri tiiiiraq lhirlg lhCn"- thrrtrng tao
rrin rndi. gdc t:ii iiltlt llrtln 11iirc song 'song .r'oi
ph.4n gihti fi:ii' nl;ii. h hrr vil c[t: t1'.rrii;g thlng
tlrirrg tirriC'ns sotlg st;irg viri ptrrln giric thu nl;lithal'
Jrhirt qiir' tlrt'r h*i "rd ili?:rr diit nliin:g (( dirong
il,i,4riri<)ng gu. rrii bin ilrin miirlr' C:icrlrrdng
tlriirg lrr6ng.goi: r-ir'i l;att l irAn nliliir gr.ri I;\ cic
ilrdng thiitg (iirig'Lir"rq' Kht,a ng citt'lr. git'1 lfit
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tt'irrl: rilrn{ c:r,r i,r ,':' ii;: r l:c iri i:r..' i:, r'31
ding. c6 .-,-i'r,,:r cii* : (,io s.i.lh rrdi s'i vr'ri ;,'';)
nghi6nr cira tan tlirc b6c l:a,i;0.
\:i ii tl6. ni:r.,iig r;iirr ilii-n ilil-r. & niriil-u iru,ri'rgr
hoe siirir rhrgc h<xr :, s iini biri iii; 'i'b so s1nli...
Xdi vi n:!l l!- ihi.:.". (it,' 11; <{ riirlh- }i' r-1'llo i) sang _
vi0c ( si- s,l i:h :r, cii? li bui;i: plr&' rriirt llgt: sinh
giiri hoin tiiin cfi khii riii:g tii suv ia c*c ihir
luc nhii 1:inr ti'crg.1 '.'isc. so r;i'i:ii, lrriil l.r.iri iil
ninr '.-iin.q 'tl;uir i5 dao. Nhrri;g -,'in .d[ 1a ii clrS
bai t:ip.
ligudi'ia {dua ra nhibu Lrai, nhi'du iii'6u bii,
toln,, tuu trring thu$c cAc rroi dung tiai lo4i niru
sau: ( f iar dibu kiin ddi ";oi tham stj .d'6 rn6t
.;rhrrong lt'irrl'. 'l-r..:,' !:;r i ,-.li c}+ :
- c6 ci, irai nElri'r)m:tr#n lior #, I
- cd it *h{t rif ngi:i,.:m lut, }ir-;n f;.i
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- c6 ii.,nir{t r:r-\i i:11}:ii:;-,t liiti i;l,n cs i'a nhii
ho;r F ; ,.,,> vi ciir riiic !;r:, t l,irii i'-:en iib r-Jt lr-
m5'i Iog"i h:1i lo{D i-iiit. .)::::;;1 circ ilrii-i i,1n iir-
rlt)i-ti6i giii lii; gil;ir rri.: ru biit i;irL.'ing .ti'inir'
thuring phei 1:ip l;ilr;, .;i '..rn..rl;J. ;'it rjrt ldi
ni;rr ii, bli t"rn's., sjrr:l: lr::! -,.1 r,ii crLc rrglliim,
Trli itr{1' riuit t}Ai la rh'i .li,'r-J r':ic l-i' thn; \ri-6t
iri tifi, hcril c rhi n g pirtrori,; p l; ir ;r <i'-\ t iri' .oi"i i cho v tr i.
i6i c'o ri:'.p iu'uU ,'i i'ii-. cr l;1 i; 11,,1n 'niti;.;tg
dao nrb irrlu tli u:,;l ri'l
Thrit v{5', }:&r:g cirril citri;r"6r: clir:l.r lin sii, b:ii
toirn so sin i.r circ r:1ii:;i:r:: r+i si, 3, dil e r-b l;A i
to6n so siltth cat:. uEhiii;i li',i sd il, iric lir. :;ri "
clfu tAe nglriirr:. \iiin d] l,lL ir c5i; ;-11r1.:r' sl sirnh
tntc ti6p r.(:,i sJ ,r,'hoirc ,iini piii-:p ci;ti"6n ri ich
hn's6,...;.ciin cdu irJijlc c&eii nli.+. ri*rr giitil n(rtr.
ilitu,ni.y phu r.;rui':c YiLn b:li ioilh {.itlnt: .x'.rt.
Trong fl vi cl -cliir':i diri', hr'-i vi ri:r ciiitr i6i
h*.t gdp li0ir b6c-'ioiin hoc vd iuiii tr'3 ar,-'. 0
dif f fii lrrrrdn,ttao' 'tlii lr'ii lt:Lu-iloe : .&.ir0rg rrin
ctua- r:n c6.ctr gilii t1 r:ir. lii:r lr;,', lilldirg ;i;11: qLr;1
lem qlgng:tliu+t t*f * s+ si:rrll; .
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lu'- I tf z " !''|, :':iI i 'E '-' tt
ti it :tltitt rrlr rg/ridrn X z- 1.
fir.ii. Liil "{ ;.i ]!;r, ;rirlrunr,. trinl: iritr
(11 -l- 11.,''; -2r"1-{.r' - l.i) * {r.
liir ia eln :i,'rc ,"iinir 3' r1E (1) r:i.r ii nh:it
n!liri!\rn r ); t.
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cir ngiriinr. .i =-2, r':1..- r'i:i 1:'i tr:: * 1bi loair
iii;u g: - 1. l,hi (l) lri rn(',! [,iirlrinq lri,rh ];ie
A'=1;(E:*tXg* 3) =i *yi +zlj + 4 > 0
1*Vs(y(t +rir.
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:.).Ndu .q > 0, ti','c ii r:6u y )> -- !, thi phuor]$
trinh c6 it nh{t ,r:r6t r:ghi{m r:iunng (r'i n0u eh
l:ai nghifrn { n t,iri S -( rr;:
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rl illr; iti.^:-r cf,l bii i,riur.
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I'i rlri f. 'firn':5 dF pirr+rrg lrilrr
il
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Gair. Vi6t prlrrrirt;g ir'1r,lh rlii i'l':,r rlii,'ri tlan$
?n!r13e' :' -..- '!, ..*,,' ' 1
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t:l I ll:i.r' i;ii li.riil I tir'': r'* r'iir* lir: S ,1i; rlrtilng
rht,trd B e -- :i '(-i -i- ilt',':it p;rr',rba*,'; :: 2:rE"--llr tal
hai iiin'r lr'ii ir;:*irir ii 0{;tss*X,.t} {tcd
+
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t Gidi. ViEt. phrri;ng lliuir rlE
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thi ]rii loin
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tthet, re r:hi ciin liip h&ur: bi6n thiin viii 0 (.r:
( t). fu'bing brin thi6u ur-r- isei cAc g-iir tli
cira v'vdi 0 ( is,:< ti, ta sirr: r'a li€t quii piili
I inr: nr ) l.
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Ba d6j t:,,tt lgi ,',1 sii tl r.1 rri l:l i10 .- i9 -
I)o c6 sd rli6in k'irirc lthurr nin sti riilnr efr:,r.
ilrli l;i J. {. 2.
Tl,rrr Ili t6 0 tli,i i;4ug !irrrii gi* giii r'i
dibm cia r:Ac.ildi Iin lLrui le .8, 6. 5, 5, 4, :.
fr.ll.K.'
Bei ti l3:f n di,:l,bong t"alir gtdi, n,6i d1i ddu
rfi{lt frdr ur}t tnfridAi ktlac. Dii t.hing clrqc 2di?m,
d$i ircia d.uq' !, dilm.'d$t thua. dirt.t'c.0 diilm. Ifda
Itutiii cd ci,,:] It')r,E sd di0ni !iri tluo,'xin hung triLt
dr*t theo rngl lidu chutin ndr-t 6.6. ECt qud ld ; d|i
r3p'firii nli(tl dupc 8, r{i}ri, rtli rli: thrc hai diroe
6 dt&rr,',1$i .:l;r''fftri' 0r: drgq 5 <tibm" cdc dli cln
Iar co s0 d,2m !;hdc t,haL'.
tti,i sd ,lii tiat l)iti,t, gitr rr,,r sd! diErrr tita nr,',i
rlgi rin i'tt.
Ldi ai&i {c&a Phan D*,: ls,io - 11 l"; An \h<rp
2, \shiu ii irr l,).
l'bng sd di?rrr tiiu n dQi brlng tu n (n - {). Car
rjrli cir!r i+i, rrgoAi brr Jiii dring tlrirr, c<;
tbng sd itihrn irong ?6r: lrQ.n dSd vdi nhau ld
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t1( ,t ^,i? ) * ;*,,, t t) - g2t . - i) "
- i96i'"
Ldi iidi. D0 clirrrq iriiin dbi vd tr6i pLrrohg
!rinli tir;irrh tich b.r sd hanEi:
Ni'irr .r', y rxlrrvt:rr thi. ("r + g) r') (r -
ngur'6rr. l,irrq Irrri sii tli, i.rrrrig 2rl't li s0
hai sd dc co trnh charl l! khi.c nhau,
J'1
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trinh, ta plilin lir:h 1964zu ilrunh ba srj ngtrytl;
lrorre ii6 , ,i hlti s,i hiin! nlritr vi' eo tirrh t h$li
16 khlcr'sd ttrLr 3, Vi khi ptr*n tieh 19ti4 ra thriu
1904 = 1.2.491
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chi c6 tlrb phAn lich 19643u th6u mirr 36ir
lrCn Ihco ciLc clc]r siru
r-Fu = zto.4ot*
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. n? = 0,. 1..,, Jll
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a
172 :189 (rrrotl 1Utr0)
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1734 - . Itl.(rrlocl tC00)
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1 986
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t,; ,rr,ieri'"thi co -rnt ch;rn boi .sd ciraj,o Ii.: o,
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