9 81 = = 18 2=2 9–7 9–6 3=6 9–5 4=4 9-1=8 9-8=1 9-2=7 9-7=2 9-3=6 9-6=3 9-4=5 9-5=4 - =8 - =4 - =7 - =3 - =6 - =2 - =5 - =1