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hieu cua hai so la so lon nhat co 2 chu so ma tong 2 chu so cua no bang 12 so tru bang 7 vay so bi tru cua no la bao nhieu vay cac ban
so lon nhat co hai chu so ma tong hai chu so bang 13 la so .....
tim tong cua so lon nhat va so be nhat co ba chu so ma tong ba chu so cua moi so deu bang 8
tim so be nhat co hai chu sokhac nhau va co tong cac chu so bang 13
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 : .............
bai 5 :tim cac so co hai chu so ma tong cac chu so la 13 ,tong la 36
tong hai so bang 59, mot trong hai so do la so lon nhat co mot chu so. tim hai so do
tim so tu nhien lon nhat co hai chu so khac nhau ma co tong la 17
tong cua 2 chu so la so be nhat co 2 chu so ma hieu 2 chu so do bang 7 . so hang thu 2 la 9. tim so hang thu 1