S\u1ed1 \u0111\u1eb9p th\u01b0\u1eddng \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 nh\u1eefng con s\u1ed1 mang \u00fd ngh\u0129a t\u1ed1t l\u00e0nh, v\u00ed d\u1ee5 nh\u01b0 68, 88, 69,\u2026 ho\u1eb7c nh\u1eefng b\u1ed9 s\u1ed1 \u0111\u1eb7c bi\u1ec7t nh\u01b0 s\u1ed1 ch\u1eb5n ch\u1ee5c (00, 10, 20,\u2026), s\u1ed1 chia h\u1ebft cho 5 (05, 10, 15, \u2026).<\/p>\n
C\u1ea7u l\u00f4 \u0111ang ch\u1ea1y d\u00e0i nh\u1ea5t nh\u1ea5t l\u00e0 c\u1ea7u l\u00f4 trong kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh th\u01b0\u1eddng xuy\u00ean xu\u1ea5t hi\u1ec7n, t\u1ee9c l\u00e0 ra li\u00ean t\u1ee5c, kh\u00f4ng b\u1ecb l\u00ean gian (c\u00f3 th\u1ec3 c\u00e1ch 3 \u2013 4 ng\u00e0y l\u1ea1i n\u1ed5, c\u1ea7u l\u00f4 n\u00e0y gi\u1edbi h\u1ea1n trong 20 ng\u00e0y \u0111\u1ebfn 45 ng\u00e0y)<\/p>\n
Nh\u01b0 v\u1eady, ch\u00fang ta \u0111i t\u00ecm c\u1ea7u l\u00f4 \u0111ep t\u1ee9c l\u00e0 t\u00ecm c\u1ea7u l\u00f4 kho\u1ea3ng th\u1eddi gian n\u00e0y th\u01b0\u1eddng xuy\u00ean n\u1ed5 trong th\u1eddi gian 1 th\u00e1ng \u0111\u1ebfn th\u00e1ng r\u01b0\u1ee1i v\u1eeba qua. M\u1ee9c \u0111\u1ed9 \u0111\u1eb9p c\u1ee7a c\u1ea7u l\u00f4 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1eb1ng t\u1ea7n su\u1ea5t xu\u1ea5t hi\u1ec7n c\u1ee7a c\u1eb7p s\u1ed1 v\u00e0 kho\u1ea3ng c\u00e1ch th\u1eddi gian m\u00e0 c\u1eb7p s\u1ed1 t\u00e1i xu\u1ea5t hi\u1ec7n.<\/p>\n