em phai tim so lon hon 5 ma la so co 1chu so la;6;7;8;9.Vay so 6 cong voi so lon nhat co 1 chu so la 9 , tuong tu voi 7 cong , v.v...,
co tat ca ... so co 2 chu so ma tong hai chu so cua moi so do bang 8
CAC BAN GIAI RA HO TOI VOI
co tat ca bao nhieu so co hai chu so ma tong hai chu so cua moi so do bang 8?
co tat ca bao nhieu so co hai chu so ma hieu hai chu so cua moi so do bang 6?
viet tat ca cac so co sau chu so ma tong bang 2
viet tat ca cac so co hai chu co tong cua chu so hang chuc va chu so hang don vi la 8
bai 4 viet tat ca cac so co ba chu so ma chu so hang tram va chu so hang don vi deu bang 1 :
Cau 1 co tat ca ..... so co 2 chu so ma hieu 2 chu so cua moi so do bang 6
Cau 2 so lon nhat co 2 chu so ma hieu 2 chu so cua moi so do bang 5 . La :.............
Cau 3 so be nhat co 2 chu so ma tong 2 chu so cua moi so do bang 9 . La : .............
hay cho biet co tat ca bao nhieu so co hai chu so ma tong hai chu so cua so do khong be hon 15
co tat ca bao nhieu so co hai chu so ma tong hai chu so do bang 9
bai1 tim so lon nhat co hai chu so ma tong cac chu so bang 15 la.............................................................................. tim sonho nhat co hai chu so ma tong cac chu so bang 5la.............................................
