Toán 8+1=9 + =9 2+7=9 Toán 9-1= 9-2= 9-3= 9-4= 9-8= 9-7= 9-6= 9-5= Toán 9-1= 9-2= 9-3= 9-4= 9-8= 9-7= 9-6= 9-5= - - 9 - 9 - - 9 - 9 0 Toán - - 9 - 9 5 9 - - 8+1= 7+2= 6+3= 9- 2= 9- 3= 9–8= 9- 7= 9- 6= 9-1= 9 Toán 4 - = Toán 9-2= 9-8= 9-7= 9-3= 9-6= 9-4= 9-5= 9-1= 9 - - 9 - - - 9 - - - 3 - 0 7+2=9 6+3=9 9–1=8 9–2=7 9–3=6 9–8=1 9–7=2 9–6=3 5 4 - = - 8+1=9 9