8-4=46-3=37-5=22-1=1
(2)-(1)=1,(7)-(5)=2,(6)-(3)=3,(8)-(4)=4
2-1=17-3=48-5=36-4=2
分别是2 1 7 5 6 3 8 4
2,1,6,4,8,5,7,4
2-1=1 7-5=2 6-3=3 8-4=4