- = - = - = - = - = - = - TÝn h: 6 - - - - 6 - TÝn h: 5+1= +3= 4+2= 6-5= - 3= 6-2= 6-1= = 6-4= 6- TÝn h: 6–4–2= 6–2–1= 6–2–4= 6–1–2= 6–3–3= 6–6 = a ViÕt phÐp tÝnh thÝch hîp: b a ViÕt phÐp tÝnh thÝch hîp: b – ViÕt phÐp tÝnh thÝch hîp: = – =