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8-7:{6-5:[4-3:(2-2:2)]}

Răspuns :

8-7:(6-5:(4-3:1))=
8-7:(6-5:1)=
8-7:1=1
8-7:{6-5:[4-3:(2-2:2)]}=
8-7:{6-5:[4-3:(2-1)]}=
8-7:{6-5:[4-3:1]}=
8-7:{6-5:(4-3)}=
8-7:{6-5:1}=
8-7:(6-5)=
8-7:1=
8-7=1