!"#$%&'(')*+&,-,'* .,/.*0.*12*34*56*76*568$76 9: - ;<9:%+ - 7$=+>/$+3? +!46@+!4A/BC !" 6,D3E('F+$/7G= 6,D3E('# !"#$%&'(')* +&,-,'*.,/.*0.*12*34*56*76*568$76 #$ %&' ()*# +, /01H#+IBJ!10AK!"#$%&'(' )*+&,-,'*.,/.*0.*12*34*56*76*568$76 2&'3%4 *56, !4('L$>M F3G 78'9:,; N O+3P,$$)Q,+$ %&'(')N H>GKR H%& ( ) ' B ' 3 B 3 B ⇒ + M M M H%& 'M ( ) B ' 3 3 B ⇒ + M M B N SK&,-,'**T*UN H>GKR ( ) '*3*B V B ∈ ≠ WX6+&,-,'VVTVU FY N N HK.,/.N6$%=N .?/K2Z[@12K $%@#K.,/.%= .*U* HK0.N6$%=N .?/K2Z@,Z 12.#K0.%=*\* N .,/. $ 0 . @!PB] .$+',N F.^,K.?/K2Z Y+..@'12 0.6@,Z'12 N N N F$ HK568('',.* /,+]B568('',. K2ZN O+3P,Q,S HK76N6+]B76 (',.K2ZN O+3P,Q,S +Q,S]B568$76N H>GKR ^1'>'3G=*+!P& !10?.$+',('+]B 568$76 < =>?@, F$ N F$ 6KB3_TI@B> C*',!@!-+@B>G KR`a H?-$3++Q,G /,/,L,('3+N b/,L,KB3I" c"L' c"L3 !4+dKB7H 7_TeFYf_XeghX 'Xgig O T O Ug O 3X' \T \V ' O X3 Tg gV 3 O X T_ UV O ∉ ∉ ∈ = + ∉ = + ∉ = − ∉ XjT_kUV∈O 7__eFYk_Xe\hX 'Xlj{`∈m\i `V\ `V$ `n_} ]\i `$\ ` ⇒`∈56e\i*\X ^-'"KB3>/N 'K/3GKB*12K2KB$ $o H'@568e\iV\Xj `∈56e\i*\Xj j5eXj{***i*_*} ]`∈56e\i*\X$`n_ /`j lj{} 3X7j{`∈m` V` TV` \$ `pp} ]` V` TV` \ ⇒`∈76eVTV\X B76eVTV\Xj\ ⇒`∈76eVTV\X j7e\Xj{V\V_} ]p`p/`j\ 7j{\} N ^#!3 7_geFYf_Xe\hX N 7+3]NOG]B]N .+qfTQ,P r3@Q,P*Q,PsT H@BHS N Q,P!,$q'!( H%.+N F$ F$ N N F#.+K'eQ,PX]'@Q,' -]$2**TN ' V' $' T F0t81,t=Bqu^,$q'!(3@u 7+>o$]B'*3' *' V' T$p'pT ⇒'∈76eVVTX H]B76eVVTXN jTVj V TjT 76eVVTXj Tj_ 76eVVTXj7e_Xj{V_VV \} cp'pT⇒'j .+K3'/,Q,PN .+!@KQ,P F#.+K'ep'pTX H]' V' TV' ⇒'∈76eVVTX jTVj V TjT 76eVVTXj Tj_ 76eVVTXj7e_X j{V_VV\} cp'pT⇒'j .+!@KQ,P N ^#$@BS!3N 7_UeFYf_iXe_hX F$ 12v,K, 'T1⇒w(''KisU B' M ⇒'@wKU ⇒' gV''1PB>'+. iU*U*\U⇒'jiUKx'B" c?'$c('F*KB7H$$o N H>]3KRGN y4K/3G*12K2Iz* `a*3), F#.$EIB3a':K'eX '∈ W .$E'T],/ 'G@wKisU .$EA'/' A@wKi*!@'@ wKU$'p H'@ggjiU ggjU ggj\U c.$E'1*BiU1 ⇒.$EKiUeX F$ F2-,B=@PIB1'31 FYk_T ^#B=@PIB1'3 A;B)C*D9E,; , ' B ' 76eBVX ' ⇒ M M M %= ' \ ' 76e\VX ' ⇒ M M M , '3 M B568e3*Xj ' ⇒ M %= i i {68eVX ⇒ = M M ?4F9,; FSK+Z3G!"A> 6!D54%GHIJHK 9,; - 9Kt,I+d,xA - rIBK+3!" ' - 8B+7Hg*\e7HX ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff g H*i H=(.*-.++('1Z>]#|64*>q+ .,/*Q,S&,s 9: #G+3+?-a%.,/^s3-$=Q,S &,s!P%+ +!4 P,!10t}'('.,/>?!R.6@%D*K >%+$G3 !" 67('+$/7G=Q,S$3 67('#A +('1Z>]#|64*>q+. ,/*Q,S&,s #$ %&' ()*# +9(L>5M=>; 2&'3%4 *56?, !4('L$>M F3G N N F+>E,-!.('B4.,/'K ]N 8G+q!PB'!!PB >/>=. /,Q,S]B+>E,-!.('. *.,/1Z*.,/dBN O+3P, /,Q,S4'.,/w &,NY+&,N O+3P,Q,S&,sN O+3P, ~8t,eUhX FY ~~7 i F$ N F$ N F$ N F$ 7 XH%e',3x&,sX 'X−_•eiT−gX−e−X 3XT_−e−T−X•ei−\X €=Q,S3x&,s"? -'a%>/N XH%' '−T_−eig−T_X• 3_\•eT−_\X−T F#'K/3GN 'K/3GKB*12K2KB$ $o 7H]B`3 'Xi−eT−`Xj 3XiT−e•`Xji X\•e−•`X−eii−`XjTT F$#K/3G>]3 7'K/3G*12K2KB$$o 7H%)+.,/`G ' 70x69 ≤≤− 3−T_ ≤ `pTg −iip` ≤ i !4@B −F$/,4,!4@B$ ',!@/,L,#!#K −F$'@B*[!E@B>1o H?-$3++Q,G 7iH]B.,/'3 7 ehX XH%e',3x&,sX 'X−_•eiT−gX−e−X j−_•iT−g−•j 3XT_−e−T−X•ei−\X jT_•T••i−\j XH%' ( ) ( ) 'X T_ eig T_X T_ ig T_ j T_ T_ ig i − − − + = − − + + − + + − + = − ( ) ( ) 3X_\ eT _\X T _\ T _\ T j _\ _\ T T + − − = + − − − + + − = 7 e\hX 'Xi−T•`j `j− `jU 3XiT−e•`Xji iT−−`ji i−`ji −`j−\ `j\ X\•e−•`X−eii−`XjTT \−•`−ii•`jTT `−UjTT `j\i `ji 7 ehX ' 70x69 ≤≤− `jf_UVf_\V••V_UVg H)`jg 3X−T_ ≤ `pTg `jfT_VfTTV••VT_VTg H)`j X−iip` ≤ i `jfiVfiV••ViVi H)`j 7ie_hX T N N 'X ' 3X ' X ' X ' = = = − = − ' ' N= ⇒ = 'js'jf H1Z?`+!E.,/'> +>1R0MKN ^‚>GKR 'X ' ' V' 3X ' ' X ' X ' ' V' = ⇒ = = − = ⇒ = = − ⇒ = − ⇒ = = − Khoâng coù soá naøo ?4F9,; FSK+Z3GLA 6!D54%GHIJHK 9,; - K+$+7H>'A - H?`IBK+Kt,$7H _