giai ho ban may bai kho ,ok hehe

De tui giai ho ban may bai nha !! mak thuc la ko phai giai chinh thuc dau : Bai da co nguoi giai rui , ko noi lai Bai 2,3,4,ban coi quyen nang cao va phat trien toan hoac bai tap va cac chyen de toan thuc mak noi may bai mih bjk vi tung giai het roi nhug minh … nhac ghi lam (hehe) Bai tru cau a, tat ca deu nam chuong giai pt vo ti cuon nang cao va phat trien toan tap , hehe Ban cu coi la bjk len ah < Mak mih hoi xiu hinh nhu la ban dang on thi vao lop 10 chuyen thi phai , lop 10 thuong dAu can bjk may bai , Neu dung thi tui voi ban dang cung canh ngo nek (ban o mo ?) Lam wen di , chia se kinh ngiem hi ? Ok