(ただし1と2を合せて12のような使い方は出来ません。)
36個の解法が見つかりました。
((1+7)+(8-6))=10
((1+7)-(6-8))=10
((1+8)+(7-6))=10
((1+8)-(6-7))=10
((1-6)+(7+8))=10
((7+(1+8))-6)=10
((7+8)+(1-6))=10
((7+8)-(6-1))=10
((7-6)+(1+8))=10
((8+(1+7))-6)=10
((8-6)+(1+7))=10
(1+((7+8)-6))=10
(1+(7+(8-6)))=10
(1+(7-(6-8)))=10
(1+(8+(7-6)))=10
(1+(8-(6-7)))=10
(1-((6-7)-8))=10
(1-((6-8)-7))=10
(1-(6-(7+8)))=10
(7+((1+8)-6))=10
(7+(1+(8-6)))=10
(7+(1-(6-8)))=10
(7+(8+(1-6)))=10
(7+(8-(6-1)))=10
(7-((6-1)-8))=10
(7-((6-8)-1))=10
(7-(6-(1+8)))=10
(8+((1+7)-6))=10
(8+(1+(7-6)))=10
(8+(1-(6-7)))=10
(8+(7+(1-6)))=10
(8+(7-(6-1)))=10
(8-((6-1)-7))=10
(8-((6-7)-1))=10
(8-(6-(1+7)))=10