cho cac so 8,.9,10,11,12 . sao cho tong 3 so o hang ngang , cot doc bang 30. vay so o giua la......
1/ tinh : 1 giờ : 3= ...phút?
2/ lop 2a co 4 ban; lop 2b co 5 ban du thi violypic cap thanh pho . Cac ban cua hai lop bat tay chuc mung nhau moi khi di moi nguoi mot lan. Hoi co tat ca bao nhieu cai bat tay?Biết rằng các bạn trong cùng lớp ko bat tay nhau.
3/ so be nhat co 3 chu so khac nhau cua phep chia chu so hang tram cho chu so hang chuc bang thuong cua phep chia chu so hang chuc cho hang don vi la so.......
4/ cho day so :0,1,2,3,6,11,...So thich hop tiep theo cua day so do la:...
5/ so lon nhat co 3 chu so khac nhau ma tong cac chu so cua so do bang 21la:....
hai so co tong bang 78.Neu giu nguyen so hang thu nhat va them vao so hang thu hai14 don vi thi tong moi bang bao nhieu?
co bao nhieu so co 3 chu so khac nhau ma tong cac chu so hang tram va hang chuc bang 5
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 :
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 3 chu so ma chu so hang tram va chu so hang don vi deu = 1
tim so be nhat co hai chu so ma tich va thuong cua chu so hang don vi voi chu so hang chuc bang deu bang 3
viet phep cong co cac so hang bang nhau va tong bang nhau