+XǤQK0ӻKX\QKWKLP\#JPDLOFRP!
1JKӏ/XұQ;m+ӝL9Ӆ3KRQJ7UjR7ӵ6ѭӟQJ
+XǤQK0ӻKX\QKWKLP\#JPDLOFRP!
7ӟL7KVĈӭF+ѭQJKXQJVGWG#JPDLOFRP!
1Jj\WKiQJQăP
FҧPѫQUҩWQKLӅXYuÿmJӱLWjLOLӋXFKRHPĈӅWjLUҩWKD\UҩWWKӵFWӃ(PVӁFӕJҳQJKLKL
9jR1Jj\WKiQJQăP7KVĈӭF+ѭQJKXQJVGWG#JPDLOFRP!ÿmYLӃW
KXǤQKWKӏPӻWKkQPӃQ
7ӕLQD\W{LYӯDKӫ\NӃWEҥQYӟLPӝWVӕWUѭӡQJKӧS³QKjQKLӅXFӫDTXiQrQWKtFKNKRH
NKRDQJ´7LӋQW{LFNJQJFKLDVҿYӟLEҥQPӝWÿӅ1*+ӎ/8Ұ1;+Ӝ,NKiKD\YӅ³7Ӵ
6ѬӞ1*´
ĈӅEjL+LӋQQD\QKLӅXEҥQWUҿFyWKyLTXHQQJKLӋQFKөSҧQK³WӵVѭӟQJ´ÿӇWKӇKLӋQEҧQ
WKkQNKҷQJÿӏQKFiLW{LFӫDPuQK%ҵQJEjLYăQQJKӏOXұQNKRҧQJWӯDQKFKӏ
Km\WUuQK
Ej\VX\QJKƭFӫDPuQKYӅKLӋQWѭӧQJQj\FӫDJLӟLWUҿ
+ѭӟQJGүQFiFKOjP
0Ӣ%¬,
1rXYҩQÿӅ
7+Æ1%¬,
1rXYҩQÿӅYjJLҧLWKtFK
&KөSҧQKWӵVѭӟQJWLӃQJ$QKJӑLOjVHOILH
GQJÿӇFKӍWKyLTXHQWӵFKөSҧQKYjFұSQKұW
WUҥQJWKiLÿăQJWҧLOrQFiFWUDQJPҥQJ[mKӝLQKҵPWKXK~WVӵFK~êFӫDPӑLQJѭӡL1JKLӋQ
FKөSҧQK³WӵVѭӟQJ´WUӣWKjQKFăQEӋQKGÿLÿkXӣÿkXOjPJuWURQJWUDQJSKөFQKѭWKӃ
QjRFNJQJFyWKӇFKөSҧQK³WӵVѭӟQJ´QӃXNK{QJFKөSVӁWKҩ\NKyFKӏX
%jQOXұQÿ
7KӵFWUҥQJ
+LӋQQD\FK~QJWDEҳWJһSKLӋQWѭӧQJFiFEҥQWUҿJLѫÿLӋQWKRҥLOrQFKөSҧQK³WӵVѭӟQJ´
EҩWFӭӣÿkXWKұPFKtFҧQKjWҳPNKLÿLFKDWURQJFiFFXӝFKӑSKӝLQJKӏVDQJWUӑQJ
WURQJÿiPWDQJ«EҩWFӭWKӡLJLDQQjRKӑVҹQVjQJ³WDNHDQGVKDUH´FKөSYjFKLDVҿ
6DX
NKLFKөS[RQJFKӍQKVӱDYjQKLӅXQJѭӡLÿăQJWҧLFKLDVҿKuQKҧQKWK{QJWLQWUrQFiFWUDQJ
PҥQJ[mKӝLQKѭ)HFHERRN7ZLWWHU,QWDVJUDP«QѫLEҥQEqFyWKӇ³OLNH´ѭDWKtFK
YjÿѭD
UDQKӳQJFRPPHWOӡLQKұQ[pW
YӅEӭFҧQKWK{QJWLQÿy.KLÿăQJWҧLQKӳQJWK{QJWLQQj\
EҧQWKkQQJѭӡLFKөSK\YӑQJVӁQKұQÿѭӧFQKӳQJOӡLWiQGѭѫQJQJӧLNKHQ
1KLӅXQJѭӡLQJKLӋQFKөSҧQK³WӵVѭӟQJ´WKѭӡQJEӓUDQKLӅXWKӡLJLDQÿӇFKөSÿѭӧF
QKӳQJEӭFҧQKVDRFKRKRjQKҧRQKҩWNK{QJFyEҩWFӭVDLVyWQjR
+ұXTXҧ1KLrXQJѭӡLWLQWѭӣQJYjROӡLWiQGѭѫQJFӫDFѭGkQPҥQJWӯÿyҧRWѭӣQJYӅJLi
WUӏEҧQWKkQ.KLQKұQÿѭӧFQKӳQJOӡLQKұQ[pWiFêFyWKӇJk\UDQKӳQJWәQWKѭѫQJYӅWLQK
WKҫQ
9LӋFKDPPrFKөSҧQKWӵVѭӟQJPҩWQKLӅXWKӡLJLDQҧQKKѭӣQJWӟLF{QJYLӋFKӑFWұS
EӓOӥQKӳQJFѫKӝLWӕWFKRWѭѫQJODL
1KLӅXWUѭӡQJKӧSEӏNҿ[ҩXOӧLGөQJOҳSJKpSFKӍQKVӱDWӕQJWLӅQJk\UDQKӳQJWәQKҥL
YӅYұWFKҩWYjWLQKWKҫQ
(Học sinh đưa dẫn chứng minh hoạ)
1JX\rQQKkQPXӕQNKҷQJÿӏQKEҧQWKkQWKӵFPXӕQNKRHNKRDQJPuQK
*LҧLSKiS
0ӛLFK~QJWDFҫQêWKӭFÿѭӧFYLӋFVӱGөQJF{QJQJKӋWK{QJWLQKLӋQÿҥLWKӃQjRFKR
SKKӧSYjFyêWKӭFYăQKyD
3KrSKiQQKӳQJQJѭӡLFyWKyLTXHQQJKLӋQFKөSҧQK³WӵVѭӟQJ´
'jQKWKӡLJLDQFKөSҧQKWӵVѭӟQJFKRQKӳQJF{QJYLӋFNKiFWKLӃWWKӵFKѫQWX\rQ
WUX\ӅQPӑLQJѭӡLKLӇXÿѭӧFQKӳQJJLiWUӏFKkQWKӵFFӫDFXӝFVӕQJ
.ӂ7%¬,
%jLKӑFOLrQKӋEҧQWKkQÿ
+ҥQFKӃFKөSҧQK³WӵVѭӟQJ´YjNKRHҧQKWUrQFiFWUDQJPҥQJ[mKӝL
1rQGjQKQKLӅXWKӡLJLDQFKRQKӳQJYLӋFFytFKKѫQ
&K~FEҥQKӑFWұSKLӋXTXҧ7{LYjFiFFӝQJVӵVӁFKLDVҿ7+ѬӠ1*;8<Ç1ÿӅWjLOLӋX
EjLYLӃWWҥLIDQSDJHPӟLFӫDFK~QJW{LEҥQKm\WKHRG}LYjFKLDVҿYӟLEҥQEqQKp
7ҥLÿk\KWWSVZZZIDFHERRNFRPWDLOLHXKD\NKRLF
Bằng tất cả tình yêu của người đi trước!
Th.s Đức Hưng và nhóm cộng sự