B\u00ean c\u1ea1nh m\u1ed9t s\u1ed1 kinh nghi\u1ec7m gi\u1edbi thi\u1ec7u \u1edf tr\u00ean th\u00ec c\u00f2n r\u1ea5t nhi\u1ec1u c\u00e1ch ch\u01a1i khi \u0111\u1ea7u \u0111u\u00f4i c\u00e2m nh\u01b0 sau:<\/p>\n
\u2013 Khi c\u00f3 1 \u0111\u1ea7u c\u00e2m: B\u1ea1n c\u00f3 d\u1ea1ng s\u1ed1 X0 v\u00e0 XX. V\u00ed d\u1ee5: \u0110\u1ea7u 0 c\u00e2m h\u00f4m nay ta c\u00f3 c\u1eb7p 00. \u0110\u1ea7u 1 c\u00e2m ta c\u00f3 d\u1ea1ng s\u1ed1: 10,11.<\/p>\n
\u2013 Khi c\u00f3 2 \u0111\u1ea7u c\u00e2m: B\u1ea1n c\u00f3 3 s\u1ef1 l\u1ef1a ch\u1ecdn, v\u00ed d\u1ee5 khi \u0111\u1ea7u 7 v\u00e0 8 c\u00f9ng c\u00e2m ta c\u00f3 c\u00e1c c\u1eb7p: 70, 77, 78, 87, 80, 88.<\/p>\n
\u2013 Khi c\u00f3 3 \u0111\u1ea7u c\u00e2m: Ta c\u00f3 d\u1ea1ng s\u1ed1 l\u1ea5y s\u1ed1 \u1edf gi\u1eefa 3 h\u00e0ng c\u00e2m l\u00e0m t\u00e2m \u00e1p v\u00e0o s\u1ed1 tr\u00ean v\u00e0 s\u1ed1 d\u01b0\u1edbi t\u1ea1o th\u00e0nh 1 c\u1eb7p \u0111\u00f4i ho\u00e0n h\u1ea3o.<\/p>\n
Theo c\u00e1ch ch\u01a1i n\u00e0y, khi m\u1ed9t \u0111\u1ea7u l\u00f4 X c\u00e2m th\u00ec ng\u00e0y h\u00f4m sau b\u1ea1n \u0111\u00e1nh theo d\u1ea1ng 0X0 v\u00e0 XX, n\u1ebfu X c\u00e0ng nh\u1ecf th\u00ec x\u00e1c xu\u1ea5t v\u1ec1 l\u1ea1i c\u00e0ng cao.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 00 hay 40 hay 80 h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 37, 77 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 01-41-81 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 05-45-85 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 02-42-82 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 16-56-96 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 03-43-83 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 32-72 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 04-44-84 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 12-52-92 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 06-46-86 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 17-57-97 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 07-47-87 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 24-64 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 08-48-88 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 20-60 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 09-49-89 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 33-73 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 10-50-90 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 18-58-98 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 11-51-91 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 15-55-95 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 13-53-93 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 14-54-94 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 19-59-99 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 27-67 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 21-61 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 22-62 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 23-63 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 30-70 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 25-65 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 35-75 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 26-66 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 31-71 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 28-68 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 29-69 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 34-74 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 36-76 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n
+ Khi gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u1ec1 38-78 th\u00ec h\u00f4m sau \u0111\u00e1nh l\u00f4 t\u00f4 39-79 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n