Bai 19 TLBG cac bai toan ve mat cau phan 3 hocmai vn
Bai 18 HDGBTTL cac bai toan ve mat cau phan 2 hocmai vn
Bai 19 HDGBTTL cac bai toan ve khoang cach phan 2 hocmai vn
Bai 18 BTTL cac bai toan ve khoang cach phan 1 hocmai vn
Bai 18 HDGBTTL cac bai toan ve khoang cach phan 1 hocmai vn
Bai 16 TLBG cac van de ve khoang cach phan 4 hocmai vn