a, Điền số thích hợp vào chỗ chấm:
74, 75, 76, 77, …., …., ….., ….., ……, …., 84 78, 79, 80, 81, 82, 83
15, 14, 13, …., …., ….., ….., 8, 7, …., …., 4, 3 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3
10, 20, 30, …., …, ….., 70, …., 90 10, 20, 30, 40, 50, 60, 70, 80, 90
…., 34, 35, …., 37, …., …., 40, 41,…., 43 33, 34, 35, 36, 37, 38, 39, 40, 41 42, 43
a, Điền số thích hợp vào chỗ chấm:
74, 75, 76, 77, …., …., ….., ….., ……, …., 84 78, 79, 80, 81, 82, 83
15, 14, 13, …., …., ….., ….., 8, 7, …., …., 4, 3 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3
10, 20, 30, …., …, ….., 70, …., 90 10, 20, 30, 40, 50, 60, 70, 80, 90
…., 34, 35, …., 37, …., …., 40, 41,…., 43 33, 34, 35, 36, 37, 38, 39, 40, 41 42, 43