... C(7,8,9) ========= Khoang cach cua 2 diem trong toa do: AB: 5.1 961 524227 06 6 32 AC: 10. 392 304 845413 264 BC: 5.1 961 524227 06 6 32 ========= Tong cua 2 diem A,B trong toa do: AB(5,7,9) ========= ... Rectangle( 200 , 60 , 100 , 30) ); // Ke khung : (cot,dong,dai,rong) tieude.setText(" Lop C10MT"); this.getContentPane().add(tieude); khung.setOpaque(true); khung.setBounds(new Rectangle(1 20, 1 50, 2 50, 30) ); ... Rectangle(1 20, 1 50, 2 50, 30) ); this.getContentPane().add(khung); btchao.setBackground(Color.yellow); btchao.setOpaque(true); btchao.setBounds(new Rectangle( 100 , 200 , 80, 30) ); btchao.setText("Chao");...