（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。
((5+6)+(8-9))=10
((5+6)-(9-8))=10
((5+8)+(6-9))=10
((5+8)-(9-6))=10
((5-9)+(6+8))=10
((6+(5+8))-9)=10
((6+8)+(5-9))=10
((6+8)-(9-5))=10
((6-9)+(5+8))=10
((8+(5+6))-9)=10
((8-9)+(5+6))=10
(5+((6+8)-9))=10
(5+(6+(8-9)))=10
(5+(6-(9-8)))=10
(5+(8+(6-9)))=10
(5+(8-(9-6)))=10
(5-((9-6)-8))=10
(5-((9-8)-6))=10
(5-(9-(6+8)))=10
(6+((5+8)-9))=10
(6+(5+(8-9)))=10
(6+(5-(9-8)))=10
(6+(8+(5-9)))=10
(6+(8-(9-5)))=10
(6-((9-5)-8))=10
(6-((9-8)-5))=10
(6-(9-(5+8)))=10
(8+((5+6)-9))=10
(8+(5+(6-9)))=10
(8+(5-(9-6)))=10
(8+(6+(5-9)))=10
(8+(6-(9-5)))=10
(8-((9-5)-6))=10
(8-((9-6)-5))=10
(8-(9-(5+6)))=10