N\u1eafm t\u1ef7 l\u1ec7 k\u00e8o<\/strong><\/h3>\n\n\n\n\u0110\u1ec3 n\u00e9 tr\u00e1nh nh\u1eefng k\u00e8o d\u1ee5 m\u00e0 nh\u00e0 c\u00e1i th\u01b0\u1eddng xuy\u00ean \u00e1p d\u1ee5ng, b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean v\u00e0 quan tr\u1ecdng nh\u1ea5t l\u00e0 ph\u1ea3i c\u00f3 ki\u1ebfn th\u1ee9c v\u1eefng v\u1ec1 t\u1ef7 l\u1ec7 c\u00e1 c\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi ng\u01b0\u1eddi ch\u01a1i c\u1ea7n hi\u1ec3u r\u00f5 v\u1ec1 c\u00e1ch nh\u00e0 c\u00e1i x\u00e1c \u0111\u1ecbnh v\u00e0 \u00e1p d\u1ee5ng t\u1ef7 l\u1ec7 c\u01b0\u1ee3c, t\u1eeb \u0111\u00f3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh \u0111\u1eb7t c\u01b0\u1ee3c th\u00f4ng minh.<\/p>\n\n\n\n