Tiet 134_ Dien Tich Hinh Thoi

Tiet 40_ Hai Duong Thang Vuong Goc

Tiet 66_ Chia Mot Tong Cho Mot So

Tiet 71_ Chia 2 So Co Tan Cung La Cac Chu So 0

Tiet 35_ Tinh Chat Ket Hop Cua Phep Cong

Tiet 104_ Quy Dong Mau So Cac Phan So (tt)

Tiet 18_ Yen Ta Tan

Tiet 34_ Bieu Thuc Co Chua 3 Chu

Tiet 56_ Nhan 1 So Voi 1 Tong

Tiet 114_ Phep Cong Phan So (tt)

Tiet 59_ Nhan Voi So Co 2 Chu So

Tiet 113_ Phep Cong Phan So