!"#$ ! % &'(#)*"+", +",! /01 2345"6789: +",6;.6< (:(=! 8>? 8@)1)6AB-C.D4DB! !!"#% EF>8GHD4I>6DB! JJ61;K4LJM! $%&'%N1DO*9.0:! ()* !N1DP%N1D10(00(Q !0%E8;0DB8;HDO8Q +, R41)DB4L9OSGQ -./012 !T4U% !V;W% X!V;Y% DB4L N F& LO4B 3 &)18>Z38G,1G! >838G,1)5[ N 4DB\:)]^! V:*% _L%`44!!!U72 _.%)4944Aa\ _8.%<6B ! 04 3% #5 D"#bFbbc$; P;Y)1)! d.J9.J6DB8B6Y (:(=6#DB4L2 0'8L D!! 6789: U\e.436HN .$3;D."N.H! a\Y(80'M, #U\;D12! .V2 6 GD6M% _9=_X$4:.;;4L JMN.HYe.436HN .$[ _9=_X$4:.;;4L JMe.436HN .$ YJMN.H[ &.D4=28;"MKZ! N =f)OSG. "#$ %&"'()*'+ , /012234'56789: %+;< /0=#"+ >60)3,+6 7?+,-3-93@A4> B83+C+D#"++;< EF84G9-+3;H B%+,I2#CHBJ41KL #+HI=4%M+ N4%M("##C ,O#P 1QR#3S7 ;<4-=)> 3'?@# a. Nhân vt Gia-ve: N9%(#)G9; 6;@! gI)a%h190aY12^" a4A+H(ZDM;Da8.D(i(: (=j! g1%h#.^G.;K +.1W6;@.f# k1@N.H;PZI 6B26;LD9O(6B6;L D)j! TU.:VD+3? b. Nhân vt Ma-đơ-len 7<. 2149;)G6C17(= 0.! Y%#l;4, C! B24>K8.;"42DD !29Y9 Y6m4A(^n =,O.3>%M% #C .V2 W<:'&+&3D: W*4KC>V-3D ($1'BO &84% M+#C+I N.U?M 8G[ oC. 8G[ E&. _p.?]^% 9O83? #4:W*3?:V)X & !N4I _p.? "#% 93"+3SQ:Y &XCCZ83"+ *O(,[ :,*:8O; ,*:NB\:A&X5 :VD(+ 3"*O(+3SQ: KC>V-3D($ 6#A@B qa.1JM;4:6M)% _JM%N.HrsN .t _"JMN .; rsN.H$! N.7K4L(U! $C#!DE"F5 p",";+",(#)* 4fu6;1Bt hPu9L4,^"#496; 3"P.j6:7 N .9Ye.v;g#OZ$Y 6;CS! w!YOx'% fMJ"?9 ! y:6AB-C. "#4f>?;DD4DB[ ! .V2X GH,IJIJ)0IJ ! % e*4"P .D16M)6M826M! g10zO*1.D1826M! !!"#% MO?4:fLO;1826MDL0:8GU6M! MO*.D16M)6M826M4>4DB8;! ()* !N1DP%N1D10(00(Q !0%E;6;8;6"?M)Q +, R41)DB4L9OSGQ -./012 !T4U% !V;W% X!V;Y% DB4L N & yP4B 3 e*4"P 826M[ &.D4=28;"! N =f);0D01% *Bình lun:Z]#" ! X:,;#C^7]<( 4#'#"+8 *Giải thích:_N3S3J#"K`2- XW#'#"+8 *Chứng minh:_NK`2#"3S3J X'#"+8 6 g9^"8Y;826M[ &O'.Y0(28;"! KLM 3N &: ;411%K14U)G14@0.." O\Q V;8B%.D4=v(Q 6O@ P@ 28;"k;'^4,4f 826M! M)6M4>({4UMKZ411 26;4@4a! V;8B\L^4,L10J0a ;90]")*! ,)0IJ 3)QR S%%*Y7#< 9V43P. Pk4f14L;0'411 826MY^4,4..! 28;"k;'x8GD .V2w N (f)D&44DB826M 4>.! $ &6;8;M).|X0(! N&6P8G28;"! N fvMKZ! V;M)<6B&,D;u! ,Of+.4>! 6)QR DZ,,*Y7# <9V43P. E]{,L).2D6;4@4> 818R10.! qf))4@ }).;6DB8R )0.4>2.8D0' 411! E..1411 P2! $)QR FDa"#*Y7#< 9V43P. V;,14L;4L1G+" Y^4,4.4fKHKZ! V;,4,@.(6P?Y 4BD;G6].=Q V;,^4,0JK.3;^4, 4f826Mf.! I2J )TBU3 V26M(#)G6;G] ."(f)GY]! 2% _e*4X(>8;;"(1. _VG^ 826M6;.6M, 4,;^G..826M4,4A 8;4,9v(P,^4,49! )TBU6L$ w!YOx'% 4DB0zO*.D16M)6M826M! E;0DB8;% ,6J6KALY. .V2c d"? 29 - 21/3/2011 P.HT