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"# k k R − − [ ' !.'"! .k k− − ["#d\‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡([!"+l0([gv/‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ e/V+)U| ' !.'"! .k k− − c e ' !. '"! . e k k− + −    ÷   [ze"‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡Z !B( cze"\ 98Z !B( a[ze"\ˆ ' !. '"! .k k− = − ˆ([ez‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ Cách khác| ' !.'"! .k k− − [‚( e …"e(@zvz…ze"[‚'(@ez. e …ze"cze" g/+&I,Ga‰B&60K0,*eBgBdB„//Bdx0R4&,F&YZGOJ,*!O4&,F &YZGOJ,*"#‡F&E e [ g [„//[ dx /‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡R&* Ši10K0,F&YG^0K0,*8'+l009$0K0,*84&‹./ 6e,Edx0Rdt,*B&‰00RdtKG1Te,F&YZ]0G&E$O! K0Œ0R!,F&YZ/‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ F&Y&:>,:>0mdtKeZU+U+| Z • [ e dt ed R R = ‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡Z !B"# [ / ed ed R R R R + [ e" R [e\‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ #Be" #Be" #Be" #Be" #Be" #Be" #Be" #Be" 1<7/'eB",*. !/-1(F0N _|†  [; ! ‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡!#//#Be"/[ ! /!# ‡ ! [!###/#Be"/!##/!# ‚z [#B#e"(‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ e/. •=D0&K0L?<i1j0k1!|; ! B ! O† ! =D0&K0L?<i1j0k1!|; e B e O† e -1(F0N _|† ! [ ! …; ! '!. † e … e [; e 'e.‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ +,R| ! [ e [w '!.…'e.‡† ! …† e [; ! …; e ‡!#//…!#// e V [!#/ ! /…!#/ e /‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡ e [!B"@ ! [!"‚ !   [!e"#(o g ‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ •'!.‡[‚; ! …† ! [‚!#/ ! /…!#//#B"/[#Bv"‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ #Be" #Be" {A *1 LŽD0 #Be" #Be" #Be" #Be" #Be" .=D0&K0L?<i1j0k1!|†• ! B†•• ! B• ! O; ! '†• ! |D0,280‚U‚`&L+Lk1&K0L? <i1j0k1!. =D0&K0L?<i1j0k1e|† e B• e O; e -1(F0N _| †• ! …†•• ! [• ! …; ! 'g. † e …• e [; e 'd.‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ 'g.…'d.‡†• ! …†•• ! …† e [; ! …; e  ‡!#/ L / a …!#// a …!#//[!#/' ! … e ./‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ ‡ a [ ! e d D D D D D + − + /[ " !g •gdB"0 g /‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ Có thể lập luận cách khác| •Q$D00‚U‚`&&K0L?<F|†  [† ! …† e  [!B"///!# S:Q0mF|;[!#/' ! … e . F_0N _|†  [;‡ e [!e"#(o g / •jUrUQLN8 30]&&5!,*/*i1j0k1eO‘_8<:0’&$j&K0L?O+ D0&u,‰<&<U+0+|…† e [; e / SD0070mUQLN8&5„„ #Be" #Be" #Be" 1<7%/'!B#,*. !/SOk:Q&&E&LFO0-10+0mX21/ ‚F&:Q0k010M$0+&,*F&,4&7&<“& # | q[0 ! 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DDD DcDcDc ++ ++ •d"#Bvyo(/,4‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ #Be" #Be" #B" 1<7&/'eB#,*. !/F&Y0m,HZ[ dm dm P U e [x\wZ &L [Z…[!"\ ‡[ td R U [#Bt‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚  L [ dm dm U P [!”‡,HUK8E1/‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ e/ .SZ•,F&Y&:>,:>,+550OZ a / HUK A&:<}  [} L [x‡}  [!e@x[g/‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ [ L [!‡Z•[ I U CB [g\/‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ Z•b‡$j]0Z a U+U+OZ a [z\‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ .[ • U R R+ ‡ •R P [ e /Z • [ e e / • ' •. U R R R+ [ e e ' •. • U R R R + ‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚‚ #Be" #Be" #Be" #Be" #Be" #Be"    Z•  = e Z ' … Z•. 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