a
t
a
a
IrI
r
BAo nA EAt,rgAxe
Phb tbng bi€n tQp: FlgO Sat Tir
[IOr Kt
l
lr'u si: 70 'l-r]in. Hung''Eao.,.- Ila'nQi
Dir. n6i z ,52;82,5
- fnONG c5c sd 139 r'i 143 cria bAo 'IHv'TT,
ehring ta ili tu cdctr nhin m6i vE cac sd
€lhqc quen bi6t, di d€n. elc lgnh li 'nlrfrng
r pl:6ir bi€,n dbi tr6n cAc vecttr. D6 lt nhtng lgnh
, , viet ttr*,nt chc blng ,11"c (: .,1;,.",* d6 u, i,
i. . c, rJ li c6c sr5 thuc. Tr th{y cAc Iguh dO tO 'ntriBu
, linh ch{t la nhu lin}r i: 11: -l) c6 tioh chft
. \l 0l
:
it, i2 = -r. I6nh e: (? l) ,u, ri,ih crrdt ez = l
f, "'/ \
I
Iqi-:kEIl.,:qr*dr D * Jr{
&* " -... * . +-:a;r*.-f,-&. .:.* &
*t.
'Y sfl
#irl& *
n6UY-*N eANu ?{}.*.tr
'e:
rnxc tlrt e++ t = (;!t L ) r.a nri cing ch6
\ U -"r:l I
I
r,t, gi Ia r,i i chii rrg qirr lir IAnlr: ( qu:.r-\. goc gOQ
rlgrr..vri i'lrieu kinr dhng Irb > r.al e Ia tQnir : ( lf,),
hinl d6i xirfig rlur phAn gi6c thu nhit r, lihulg
t:h6e e;ie ban mudn bi6t: < Lg nhirng ir6ich gi ?.r-.
'I'6t lfrm! I-dng mong lmudn ed tlat dAng-quf.
NS.o, ehr'rrrg ta hI_y ering nlrau ti€lp fUc kh{m ph6
Ioi ich d6. *
Gii sii ryrgt. vecto O,tI eo toa dc 16 a, b (hiflh. l)
4 ++
ddrr a r'i u li eic veu[o cton ti tri,rr tr:.rrr: hoAnh
.vh trgc lung ttri ta c6 thE vi6t :
-,&
U!! = rtu 1-.but ?
..+-
nlrung u Ii\ do u qual di 90e nguoc chiEu kim
'at-F-+-+'..s
dEng trb. vfty a : ln, n€n Oly:I :'au * btu.
Chd h'dp t:ip vi6t vb ssru tildnh (rr * bilrlvi o*b
cl6i toi chr'rng tu hif,n cdn v'6 nghilt: phii dinh
nghia ph6p cqirg hai If nh ti6: '
'Dinh nghta: Ttlng cfia hai lQnh, d&. ciro II rngi
l0nli drry th{t c6 tic dung l€n moi vecto gi6ng 1.
nhu vj$c cfern tring. Ignh di cho tfic dgng l€n
veclo 'dA cho rhi cQng (phep oQng I'eeto) h.ai
. ! .: 1
:,
a
rriy \
qir'-
-.
k€t qui i4i' Ph66r ld-v tbng cria tiui lQnh tl5 ehr.r
gSi lA phri,p cQng trai lQnh d6'
Vdi dinh ng[ia niy'' ta co thb vidt I
;fr == (o + ri)?.
tr<iug d6 a * bi lA tbng c*a hai lQnh n r.i l)i;
trl6i s6 thlrc c(, thE xern nhu nrdt IQrh ; bAi' gio
tt e6 nhirng le)nh, dgng o + bi, r'rng r:6i chriJrg
* , ta c6 c6c sd gi ? V6n hi'6u bi6t cila i:lrirng ta'vB
cAe s6, tu s6 tu lhi6n ,:lro t16n rfc sd t.htrr ri;
rdng'ld khdng r1fr db tra 1di cAu h6i ndy'. ,Yi1,'
art ld ,'hc lrr tr da ng ilri'ng Irurir: ttgtrirn{ r'irt eril
rn6t lrhlt rninh rit ra ciing li fit rr,r'irrh,lu,"rc
ni$t c6i gi m6i il6i viri t:irc bqn. nl:iiog ngucri
. eiri rndi c6 ki6n tlritc tciln hoi: ptrb thOug) S
ilinh n,)hiil. (fng r.6i m5i louh iar:g rr * bi;
. tl ndi ring ta c6 r:rQt sd phlrc c -l- hi g0nr hli
thr)nh phin :'plrd;r thvc & vi pftiin ri* ii"
tlai s6 ptrirc rr * bi r':\ c f dt sE goi l:i Ling
t'. lrirau nCu cfic lfuh ,tu'.Iitg irng li nl:tr ttliatt. (-1r'rti
bqn cil thb thfr1' ng:r+' rr'ing ,i * 0r = c l- rJi klri
vr\ chi lilii 11 : 4 q11 /.l = 6f .
r)lti i1. Ndu ta ."i6t cAr: iq1;rii .r:, 1;. i ii rr(ri ,';1*
la 0\ /b (r\ r'U l\
dr,"s (; ,). i,, ,,i {, oj ,, , r*iri; r i rri
ta *b\
c6 rlang l, l, llE nghiOn ct'ru tinlr clr:it ci,
\r, al
s6 phfi', ta r'6 tlrt qrrnr vE ,6.c linlr trrung urrg.
L . \'i rlu. d'6 nghi€u criu iir:h cria liai sd phr?c ('l'+li,)
vi (c + di), t* s€ thuc hiOn li0n t iip ha i ltlnh
la -b\ /c -d\ s
(; ,l " (O "l 'n" nt.i r ecto biit h'l r dr
it' b\
I tr)" cIO (r:, u). 'l'rrriit: hdt" tirrrq: i;i*n iinhi , ' ;.
' ' tD "l'
i a rlLrqc rreclo c6 tor dcr l.at: * iLt, ii.e -i- i:r,r) : s:ru
; ,.
rlri thrrc hiQn !t1nlr {; :i i0n yectrr nrui r::ir. iii
dtrr.rcr vectcv (c irrr' "- llUt * cl.!ht: -1- it1,), ,i(,r.r*t,rl.) ;
: + c(l:* * ,:rg.)). tr'rr: ii vecls ctl Loinh ril)
(ue:- hr!):i: * (bc + ar1)r7 vi tung tio
(ad a trc i:t' f (oc * o6)y.
, 'i'a sE ilrroc. kdt qul ctd nlrr diing Ii,,ir tlu-i'nirit
{uc * Lt'|- (1"' + c"tl\
\h,' * ,r,/ ttc - lttl J
_t
cbng i'ri phip nh{n',16i uoi cAc sd thur: (giaii
hof n. k dt lro p r .r,... l.
BAy gio tr xet rhQt s6 phi?e dang cosg * fsirrrp.
Ta rem *16 :rhu mQt lgntr vi derr; tAc dOlg l€n
nrtlt ve cl.o :n ndo {6. :fa duor: r'ectcr (cosg:!
+ isiri?)m = cosp. fi + sih,f . rr, tlong cl6 n =ir,.i
lii . r.eclo r:ir drroc b['ng cAclr qrra-i rn di gOP
ttguoc rlril,i irirrr ridng lrr'r (lrinh l). D6 chinh
lir vecto. p cd drcre tring. cSch q,,"-" ,i di m6t
go.' g (hinir 2i. \'il r:osg r rsin17 lrr li.rrlr:,,,quay
ili mdl gdc 9,,
' Ndu & l:i rr6t sti ngrrlin "drong tlri rd ring tri
cd lr-.;lrg lltut. sarr tl.1 r, {oi IA c0ng tlrr'r'c :\loivle ;
: co-r*'.p + isili/ip : (cos? * isitrp)L
''.
Yi ring vd tirLt nh:it l.i l{nlr c guay 96c _A.r! >
r:r)n r.'$ thit h:ri JA l6ntr < qua-v .{. lAn li6n ti6p,
miii 16n qual gdc Lp }]. tl5 rirng hai lf nir tto c6
l.i'l ,rrri tthtr tthntr.
t\
l'r
'l
-]
_*_-.-__*,". r #?
'Illnh 2
vg,v:
(n + eixc * dr) *(rr* * &ri) * 'llr: * t;1);.
'l';r ch(r..i ring hai 16nh 6 vI i {}ra1',,r rn ii tir
g-iao'irodn drroc r.r\ ridu thr.re lritln phep nl.rAn
(a * }i) (c 1- di) theo qu-v tic rilitlu th0ng thucrng
rbi ttray i3 bi.ng -l thi ta.cirog dngc kdt qu&'
nhu tr€n. Yi vfl-y, tir drl,r' r'B.s^au, ta cft nhAn nhu
tlrirng thudng ri'ri & il*u cu i2 thi thav bing -i.
Bing c&ch qu&i vE circ l{nh, cAc iiq.u $S ltifry I
r$r:g phdp u-r1ng ,-lr ph*p nlr&n ddi v6i *Air sS
phur er5 nli Q ug linlr rirfll quen biFt cfi:l p;.\rip
,j
Ndu nhrr itan dring e:0ng thuc c6ng cung db di6n
iii cosliQ, :-:inii/cQ tireo cosp va srncp lhi rdt v{t
r,a,, rririit lA. r.cri ft lon" vi ctrring ban l<h6ng c6
tlncyr ciing tl.lirr: tlrig quiri. Clon & d{-V, irdu ban'
n*.o di hiirt nh! th{rs }Jel'ton thi irau d(j t}pJl'
nlga-i. ring chi viQc l<lrai- lriEn r'6 sau theo uhi
tiiuc Neir*qn. ihay nrc.ri i2 bing - t'rdi vi€t ring
i-1hert 1]r1re hai .;6 bir:g ni-;au Ir'L co co.;(.,; r.a phln
ri* hti vd i-'irng b*"ng ni:rLu ia co sinrp..Catr ban
l.ir lairrr ii1. ii6u ehul i:i51. r;lri thi'rc .r.'ewton thi
cii tr1:,1 giii.i quldt l<hi Jc cc ru0t gii tr.i cr.r thE.
curl,r 1i 1sin7p :
^aos'(D l- Tcosct[,(isirrrp) 'i-
-. 21, us5,tp{isincrz } .iicosac(1s111,1 .1r i
* l'3r...ls3? i isi rr7)a + ! tt ,;slc( r51j;,e,5 1
?eos:iising)G -r- irsin?)' =
- (t.ti,''r - 2lcosSosirr2c * l5cr,s3qlsin4a -
- 7t.c,s2siri6'1" ) *' i(;r osdr.i,,'3 - ;tic,,"a'.osi,,3,o +
* 2lcoszqrsil5p .-" sinTrp)
Yar' rrrsi:; = r:os7? ' 2lcossgsin*9 *llicosSgsin4q -
- Tcosgsin6g
sirr?o = ;,'os6gsing - BJcos4gsin3g +
*:lcoszgsinr* - sin'e,
\..
(.,rltr ral nhiiu .loi lcir hh{e cira sd phrlo n:{ bgn
sE th{y khi l€n tlpe Egi hqq.
b
'*-
fr
\\
.
/
-l
i'
!:'
,t
)
HOtsG tldi nA3' rin giiri thiOrr rn6t l6p hdm sd
rlqc biQt, mil r,iQc tim cr.tc tiBu cria n6 tAt
tlc n giin do ciiu. tr(rc dic biOt cfra clrring.
Ldp hi.m sd flr'rr.r t6n gpi lir phfln thirc_ohinlr qui.
l. Phdrr rk*a ehlnh quy. (iii s&
i.,;
glx) - L rrr ''
tSphS.n tl,.r'rc cfia rnAt bi6rr.r. Ta sE n6i ri.ng
phtn thirc g(*) ld chiirir qui. ndu tbng c.{c tich
cira chc hg s6 ei cr:ra n6 v<ii bic cria cdc lirv
thua iur-rtrg irng- ai lA hing k[dng, tuc li
. t,l
' 'L diei '= 0 (1)
' t:1 .
T[i r]Lr clon giln nbSt rE phAn thirc c]ilnh
qrr i la.
i(.r) '= r -t=I- = r * r-l (& clil cl : €z : 1,
J'
dl=1,4e:-i).
. DiI;r vto dirrrg nhdt thrte ttrgng gi6c sin2z *
*cos'a - l. tx cn th? chung minlr ri.ng phfln thr?6
n(.r) = *.'l- .*i!o'+ --lgttlroda<A
,i..io, ffc{rs z :: .
iI chlnh qui. ThSr" vfry hi;r:) er5 thb vi6t du6t
dqng
'.,1(r). = c * (sinry.)i.-ni'L * iqosq).r-cQBc( .
TN
Do dd X dtci: 1 ..-sin'a-cos?a =0.
: -1
l*la
[ti1,. git] gi& srlr , .
m
,ir'1,..,r'n) - : ci"r'fli rf2t ...r'ctni (2\
i=!
li irir{In th rtc crla n birln .t'r, :r'2. ...;ro. 1 r sF DOi
rang ph*n thiLc g(r1...,;un) lri 'chilh qul nSu '
ciirfll + 6(t2ct +... -l' elrq6ni = (}
o.2tc1 + a22t2 *... * 72r,r* = 6
. .rntcl *. 4n?e2 * .., * e*rrcm = 0
C5.c nhA n th ric urOt biin
'$ mnl
gt(rr) = X .,., ?" ,.... 9n(.rn)'= E cirf;nl
..i=l. i=I
sC.atuge gqi lA eAe thinh phfin cfia phlfr t]rrle
g(rt,"'",3F).
0ur
PEIAN HUY KT.TAI
Thi du. c&c th&nlr phhn cia ;rhfrn thirc hai bi6n
-4 { -3- 4 :-2 -*2
, \ ,' f S I a I S I f ,, S
gl,r',,t/,'=.j.1' U- ttx U -r:t' lt
I, S*O
sE lA erlc phin tliuc
9t (x) == '2*
*a
r
6.9a
CUC TIEU flUA PEIAN THUC CHf IN$E
\./
-45
." +2le '' + *
t2-2
' Ez (rd= ?s T+ :y-u f y-
R6 r*.ng phln thirc a(rl,... r,r) li e hlnh t1ui,
khi vi. ehi hhi tiit ci c6.d thA.nh ph&n gr1("r'1)'
i:1,... n eria no "li chlnh q.r.i.'l'rong thi du trBn,
ph{n thii'c hri bidn S G, g) ii ehtnlr qui r.i ci.
trai tii)nh ptriin cria n6 pl(i ) vd gz{u) dBu li
clrlnir qur.
I)116r tlAl-, ch[ng ta sE dua rl nr5[ 11 ;nlr lj'mA
n6 se giirp nhiFu tlong yj0c i<ibm tra'tlnh chinh
qiri efia rniil phAn thric,
Dinh lgj 7. ltdu cSi:-phln thuc .9, & l:i chinh qui
thi cic phan thr'rr: lg (i,. U sd duo6g), S+ h,
g. h {g, ft ln kf l.riQu hirm hop quen thu6c) ciing
lil ehinh qrii.
Chirng nrlnh :r:ira rllnh if J sur,t truc ti€p trt
{llnn nghrir.
' H( qud. l{6n g (rr,..,r") iri phan thuc chlnh'-qui
thi vrii mri rn ngrrvOn duorg. ta cirng eo gu Ie.
e hinh qu-r"
Tki clu l, Xdt phln thirc' chinir qui .9(e):
.t'
'l'rI hC qtri su.v lrt plrhn, thuc
/ r \tr n r 11
l ..E, .k:0 J- It:at
.nl
/.k- ---:-.*_
" lr A'l(n - Jl)i
Cirng lI r:hinh qui. Do d6 trr- c6
no
X cH (lr.' - n):0, ruc IA 2 : AcX =
n=o ^ . \o=u
n
n. I Cfi = rln lI nhu v{y trr dE chrlng
k=0
rninh dlrruc mQt dbng nhSt thric quen bi6t.
'.n E &cH = ri"!n*1.
k=l
.|a'
. 2. Cqro riBrr ph0h rh&c chinh
UIE SU
(m
I g(c1,...,r1) * I. ckrllk.."rioo '
k:1
' ii phin thirc chinh tIui, t(rc ll
n
gi= F oigctr=0 vdi mgi i=l,...,n.Tinhehf,t
lr<t
n*I
t.r.rc tri cfra phAn thr'rc chinh qui bibu tli6n qua
:ilinh" lf ' sau d41,,.
, ' Dlnh Ii 2 Gi6 trj nhil nh5.t eiia ptr{n thirc chirih
qui (3) tr€n miBn .r l> 0, a.z ) u, .. .r.n i rr bing
t6rtg cdq h0 st'! *1,, n6, vS dat clrrcrc k5i-.r'1-12-
-'.... r:la:= I. tUr, lli
. mln
i n- In.
. g(,,'i.. .. .rn) = g(1, ,,. t ) = E ck
, ' nl > 0, {,r: i, n) ' ,. li:1
' Dinh li'2 drrur: chrrng liritrh rlr.ra trdn Irni bb
dn **r,. -
'i ,Bb de 7 t lrii I ilrlirg tlrr'rc Crrrch_r. su_r, i.i)irg)
i . (iiir sit x.'1.... :rn tir n'sS kh0ng frm th1, {,1 cdu
. 11..1.'on l* nc.15-kh0ng &rrr nru ar+,,.,+ ao =-t. Khf
d6 ta co
'. E-c{;r:;} [l .3trsk
t. - 1 1.-
li-l tr:l
ngoii ra ta cd diiu "ding rhuc khi
trl =...= ar-.
, Ilb 6lC 2. Gif, tli nh6. nhilr cfi& hAr:r s6 .
:,
9lZr...Zy1]r:'Z \iZi
i:1'
Vdi c$r:. ri.rrg Lilt)c
lz, ) o, ..Zn ) g
d: -.v^Y
{, ,i' zlt.:; zn" = -1 . (,r.
',
trong d6 Fr)0, T,)1,.r>0,'im1..., l,rrLs
._---l:_-._*
7
'n
I DAn flQc ttA Drel,
I
F)ua vC,o c{c bi6n duong m.6i .r1,...,rn nhtr rau
,.+
' I li
zi.:
-------8r,
i = 1,....n.
TF'
Khi d6 h&m sd g(2t,...,2o.\ tr:& thirnlr him s6
n .Y.
(r(r1....rn) : .X " ., i
,. i-t T
vi rAng bugc.(4) tr{i th&nh rA.ns bu{ic sau
{ -Yr}0""';'o}o
.,r Tl "(z To
quI
' !r)
{5)
(8)
lr,'1
;1 = r{,r ;i {it'l''\-'
: \,=r\ri / l. s
l{lrrr r:Av ta chu,rbn v6 bii to6n tirn, cuc ti}u
hirnr s6 (5) r.6i ring tiudc (6).
' Cia.sri' .'r3....;r, ld rftr: sfl iuy i' tlr5a nrfln riog
hrrir: (6). tl,eo hb rlB ! tn c6
"TtTD
O(.r1..r,)= 3 * r',rr,'i...,.f- :atG)
I
l- I
MItrkh6e ndrr'l6y rf =.1r r'6i mgi i:1,... n,
t{hi d6 ro rAog (r'i,..., *,f) tt,6" mtrn rang lrugc
(6) i'i tr et1 /r
' O{rf,... "f}:,1,
' i.' -l
OiEu d6 <;hr'rng t6 ring nil@ (.r1.... rrr) i'11. .
Yi d{ir d&ng thirc.trong (7) t.tri c6 tfti nt0t atiBm
iluv ririit, nen (.ts,...-tf; l:i riilrr, euc tiBu du-v
uhit tire hArn sr1 (5) v6i rdng 6u$c {6). R0 rAng
giir tri be nh{t crja h:i-m qd q {2.t,..,, Z,r} vtli rirng
irrr0c iJ i_ e n ng bing 1i" Cuc ti6rr clo. s0 ctat tai
tlibnr i2tr,...2#l duy nhnt. trong ri6
.z\:! l/T) (Tir0i) ,lr.
llii rll 2 drrge *h.unC rrrinir hoin [orin-
Clttng. ntinh d.inh ty 2
I "l'rir'#r: hf,t rlt r{,.rirng
-nl .
tttirr yi.r i..... ro) -ir g ll. '. I i -- t ck - (S)
' .r;) tl - !.:i
Gii sfi (,r'1... c'n) ii ri0i ,libnr li-r' -f vdi c6c
t,;:r tl0 cf iurrS. UA t
rrk :qk ,i'o.. ..|o, L -r, i. 6rn
.Ta .sE tirirng min'h r&ng
in' nl
il rrfk * I1 tlo (St'
'' k=l K k=l li
q={T1*,,.ir.i{r il f 3_-it'jTtf "1-irr
\ 1=i \ iv / I ,
. 9ie tri' nho nhrlt <1at rlu,.rc lai llibrn rlrry rrli:i tr
(2T,...,2\1. tr.<,frg t16 ; '
'., - t ,rT *rT ..,*oT' *.At
trong tltl
(cl
vi'ehi hhi
'i
|'
Tr-l-,'
'I
t I lt / D'rY\
or- rt l , i l)i irtl
zr --l ll l**-l I
' /1 \ lY., I
lJr \i:t.\,it /
11 ilal' ,.= Tr *.;.*T'o.
Chttng minh cira bb db
t CJrrirrg rrinh edq bh (ft 2
4
\
i
L
ii
l
i
l.
1
i
l
J.
i
!,
i
1,
t
l'
.l
i
ii
:i!p
ny
Pil
1..r
.t
rnin gz @) = giz (1) = 2n
,r)0
min gs (r, y).: gS (1, f): ? * ? * 1 = 5.
!.. Tim pgc titu tria phsn thuc
.nn
'tt G.ui - *ffiYo *,:,
ii _J
'9s(s,u)=2r ",.+3r''',i/ 5
J-
l*u 'l' r' s$0
-. Nhy trong mue l tI[ e]il ra t{t ci. e&u pli6n
thiic d6 dEu lA chinh qui. Theo ttinh tf '2 ra c6
' min gi (,r) = gr (1) : t*sinp*r,osF
.u)0
.1..
nl-
s
fi -- tr. (Iik eg 7 0, i = l.-.,, n ta c6
k*- I
m lll I rCi.
n ulk '= tl { cr..,,?1k... ,rank i -
k:t k:l \ tt i
mlng
n cf k, n .i.l'u a lk .,. n .r'r'k Bnk
k:l " k=r 'i " k:l
mnl
n clk ,QI ... .i.Q, = fl clk,
k=l Ii I n k:tK
D6t .,1 : II cfk |a xdt bii toan sarr: 'l'iur
, t._r l\
^*
I
k+l
/i s^ 1;
:
*-
'!f
1.r. : rnin lZ1* Zs + ... + Zm)
vdi rang bu6c
. t Zt)}t,..., Zn>A 6
5 ,?' /3'... zl,* = -r (io)
\ ''
tlng dr;ng vdo trii tua.n ndv bb dA 2 lihi n = rrr;
.F_l = i; Tl + "i r;a,gii rr'i l, 'hhi itrt ta c6 p F*T:
Tt*... * T- = ci * ... * c-. ''
Chu .f riug dr.ra r.Ao ilang lh[r.e (g). la rhdy
c{c sd 4i,,.., ura x{c ilinh niirr tr6n tii6a rnfr* ri.ng
bu6c'(10). Do cl6 r-6i r1 ) 0,..., ro ) 0 tt3,: !
tac6 '
'9 (s1,.'. +o): : rrs-.}Y. =- I ch-
li=1
,' . B{t diag thrtc n*.rjcing v<ri b{t a&ug ihftr, (a)
puy re <IiEu ph&i chrlng minh..
3. LIag dgng, K6t qtri t jrtl cirrry,, troug mue
trOq pp thB Lrng dung d€ giii'niliBu bii toan eLrc
tri,
1, X€t p{.c phArr thuc'
../ \ , sioB cosg - T
, rJt\u) =c-t--*r + r, 0<p<*-
siiiB .eooB I
*t''
I I \n
9.2 (,r) = !r +
- |
. \ \ rl
:
tren,miBn rlO,y)0
Cld thA thd1, riing
ilnl/l\
I --;*--F E I l=0'ra
,r+l k=t li \ lr4t /
'Ilt
1,n* I " (.4')=o \
k=I ^
do d6 phin thue g (e', y) iA chinh qui. Vi r q1-.
tlieo dinh l.v 2
nl
' ming(,,ir) =g11,' l):l* E +-
;ultt 1t"1. A'
Y>o :
4. Cho.3 vtrng trdn t&nr A, t), t: rcri bfn kinh
a, b, c tuorig trng, tiing dl6i nrdt tielp xirc ngodi
vdi nh4u. Xct A .tBC r,A lriy chung rrrinir r&ng
.,'l A \ z / B \
..,rts, \I:lcots't*)
*eo,gz (+) core2 (+i
" / c \ t r \
* cors2 (+) .orsz ( , )r"" (1r)
nit p= a* b ! "; u = JB = at'bi u :' BC
sbtciry=AC7a*c' '' '
,l '4
Ig
2
--;. -