36-(9-1) 64+20
39+8 22+(3+2)
37-10 52-(8-3)
14+(3+67) 32-4
43-3+27=
43-(3+27)=
30+11-4=
30+(11-4)=
28-7+ 5
30-6-8
20-(9-8)
22+(15-7)
。
8