Số? a) 1 969, 1 970, 1 971, 1 972, ……, ……, …… b) 2, 4, 6, 8, ……, ……, …… c) 1, 3, 5, 7, 9, ……, ……, …… d) 5, 10, 15, 20, 25, ……, ……, ……
Giải thích
a) 1 969, 1 970, 1 971, 1 972, 1 973, 1 974, 1 975.
b) 2, 4, 6, 8, 10, 12, 14.
c) 1, 3, 5, 7, 9, 11, 13, 15.
d) 5, 10, 15, 20, 25, 30, 35, 40.
