1. Tim trung binh cong cua tat ca cac so tu nhien co 4 chu so khac nhau duoc viet boi bon chu so 0;3;5;7.Trung binh cong cua tat ca cac so do la?

2 .Tong cua 3 so bang 5,2. So thu nhat bang 2/3 so thu ba va so thu hai bang 50% so thu ba. Tim so thu hai?

3. Tim mot phan so co mau so bang 25 , biet rang neu cong tu so voi 34 va nhan mau so voi 3 thi duoc phan so moi bang phan so da cho. Tim phan so do?

4. Tim mot phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi bang 1, con neu giu nguyen tu so va cong them 3 thi ta duoc phan so moi bang 1/2 .Tim phan so do?

5. Hay cho biet co tat ca bao nhieu so co 3 chu so ma tong co chu so cua moi so bang 4 . co tat ca bao nhieu so thoa man?

A)Viet 5 phan so bé Hon 1,co Mau so la 7 va co tu so lon hon 0:

B)Viet 5 phan so lon hon 1 va co mau so la 5:

C)Viet 5 phan so bang phan so tam phan muoi hai :

D)Viet cac phan so khac 0 co tong cua tu so va mau so bang 7:

E)Hai phan so lon hon 1 co mau so bang 7 la :

G)Hai phan so bang 1 la:

H)Khoanh vao cac phan so bang ba muoi sau phan nam tu: Hai phan ba; sau phan muoi nam;tam phan muoi hai;muoi phan muoi nam 

Giai ho minh bai toan nay nhe !Minh dang can bai toan nay trong ngay hom nay.