3 = 3 + 0 + 0 + 0 : 3000 -> có 1 số
3 = 2 + 1 + 0 + 0 : 1200, 1020, 1002, 2001, 2010, 2100. -> có 6 số.
3 = 1 + 1 + 1 + 0 : 1110, 1101, 1011 -> có 3 số.
Vậy có tất cả:
3 + 1 + 6 = 10 (số)
Đáp số: 10 số
Co bao nhieu so co 5 chu so ma tong cac chu so cua moi so do la 3
co bao nhieu so co 4 chu so ma tong cac chu so cua no deu la 4
hay cho biet co tat ca bao nhieu so co 3 chu so ma tong moi chu so cua no la 4
hay cho biet co tat ca bao nhieu so co 4 chu so ma tong cac chu so cua moi so do la bang 4 la so
co bao nhieu STN co 5 chu so ma tong cac chu so cua no la 3
hay cho biet co tat ca bao nhieu so co 3 chu so ma tong cac chu so cua moi so bang 4
Hay cho biet co tat ca bao nhieu so co 3 chu so ma tong cac chu so cua moi so do bang 4
hay cho biet co tat ca bao nhieu so co 4 chu so ma tong cac chu so cua moi so do bang 3
co tat ca bao nhieu so tu nhien co 2 chu so ma so do bang 7 la tong cac chu so cua no
