Nh\u1eb1m gi\u00fap th\u00ed sinh l\u00e0m t\u1ed1t b\u00e0i thi m\u00f4n To\u00e1n cho k\u1ef3 thi n\u0103m 2016, Th\u1ea7y gi\u00e1o Tr\u1ea7n Ph\u01b0\u01a1n h\u01b0\u1edbng d\u1eabn c\u00e1c em h\u1ecdc sinh \u00f4n thi THPT Qu\u1ed1c Gia b\u00e0i gi\u1ea3ng \u201cPh\u01b0\u01a1ng ph\u00e1p c\u00e2n b\u1eb1ng h\u1ec7 s\u1ed1\u201d c\u1ee7a th\u1ea7y gi\u00e1o Tr\u1ea7n Ph\u01b0\u01a1ng. Th\u1ea7y Tr\u1ea7n Ph\u01b0\u01a1ng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 m\u1ed9t trong nh\u1eefng chuy\u00ean gia h\u00e0ng \u0111\u1ea7u s\u00e1ng t\u1ea1o v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p v\u00e0 c\u00e1c k\u1ef9 thu\u1eadt ch\u1ee9ng minh B\u1ea5t \u0111\u1eb3ng th\u1ee9c t\u1ea1i Vi\u1ec7t Nam<\/strong>.<\/p>\n

B\u00e0i gi\u1ea3ng cung c\u1ea5p Ph\u01b0\u01a1ng ph\u00e1p c\u00e2n b\u1eb1ng h\u1ec7 s\u1ed1 l\u00e0 1 trong nh\u1eefng k\u0129 thu\u1eadt hay v\u1ec1 b\u1ea5t \u0111\u1eb3ng th\u1ee9c AM -GM gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n v\u1ec1 ch\u1ee9ng minh b\u1ea5t \u0111\u1eb3ng th\u1ee9c hay t\u00ecm Min – Max, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c b\u00e0i to\u00e1n v\u1edbi h\u00e0m kh\u00f4ng \u0111\u1ed1i x\u1ee9ng, c\u00f3 \u0111i\u1ec3m r\u01a1i l\u1ec7ch kh\u00f4ng b\u1eb1ng nhau.<\/p>\n

<\/p>\n

Th\u1ea7y gi\u00e1o Tr\u1ea7n Ph\u01b0\u01a1ng l\u00e0 t\u00e1c gi\u1ea3 c\u1ee7a 22 \u0111\u1ea7u s\u00e1ch cho h\u1ecdc sinh THPT v\u00e0 h\u1ecdc sinh gi\u1ecfi thi qu\u1ed1c gia, qu\u1ed1c t\u1ebf. \u0110\u1eb7c bi\u1ec7t, v\u1edbi cu\u1ed1n s\u00e1ch “Nh\u1eefng vi\u00ean kim c\u01b0\u01a1ng trong b\u1ea5t \u0111\u1eb3ng th\u1ee9c to\u00e1n h\u1ecdc” d\u00e0y h\u01a1n 1000 trang th\u1ea7y \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 m\u1ed9t trong nh\u1eefng chuy\u00ean gia h\u00e0ng \u0111\u1ea7u s\u00e1ng t\u1ea1o v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p v\u00e0 c\u00e1c k\u1ef9 thu\u1eadt ch\u1ee9ng minh B\u1ea5t \u0111\u1eb3ng th\u1ee9c t\u1ea1i Vi\u1ec7t Nam. B\u1ea3n t\u00f3m t\u1eaft c\u1ee7a cu\u1ed1n s\u00e1ch \u0111\u00e3 \u0111\u01b0\u1ee3c trao t\u1eb7ng cho 95 \u0111o\u00e0n thi To\u00e1n Qu\u1ed1c t\u1ebf IMO l\u1ea7n th\u1ee9 48 t\u1ea1i Vi\u1ec7t Nam (2007).<\/p>\n

Th\u1ea7y gi\u00e1o Tr\u1ea7n Ph\u01b0\u01a1ng \u0111\u01b0\u1ee3c nhi\u1ec1u h\u1ecdc sinh qu\u00fd m\u1ebfn b\u1edfi phong c\u00e1ch d\u1ea1y h\u1ecdc r\u1ea5t ri\u00eang v\u00e0 c\u00f3 hi\u1ec7u qu\u1ea3. Th\u1ea7y th\u01b0\u1eddng d\u1ea1y nhanh, c\u00e1c b\u00e0i gi\u1ea3ng c\u00f4 \u0111\u1ecdng, s\u00fac t\u00edch v\u00e0 th\u00edch h\u1ee3p v\u1edbi c\u00e1c b\u1ea1n h\u1ecdc sinh kh\u00e1, gi\u1ecfi. Trong m\u1ed7i b\u00e0i gi\u1ea3ng c\u1ee7a th\u1ea7y, l\u01b0\u1ee3ng ki\u1ebfn th\u1ee9c \u0111\u01b0\u1ee3c cung c\u1ea5p kh\u00e1 l\u1edbn v\u00e0 \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00f3 s\u1ef1 b\u1ed5 sung nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp phong ph\u00fa v\u1edbi m\u1ee9c \u0111\u1ed9 kh\u00f3 chi\u1ebfm t\u1ef7 l\u1ec7 cao.<\/p>\n

D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u00e0i gi\u1ea3ng c\u1ee7a th\u1ea7y Tr\u1ea7n Ph\u01b0\u01a1ng v\u1ec1 \u201cPh\u01b0\u01a1ng ph\u00e1p c\u00e2n b\u1eb1ng h\u1ec7 s\u1ed1\u201d:<\/p>\n