(ただし1と2を合せて12のような使い方は出来ません。)
40個の解法が見つかりました。
(((9+9)-8)-0)=10
((0+(9+9))-8)=10
((0+9)+(9-8))=10
((0+9)-(8-9))=10
((0-8)+(9+9))=10
((9+(0+9))-8)=10
((9+(9-0))-8)=10
((9+(9-8))-0)=10
((9+9)+(0-8))=10
((9+9)-(0+8))=10
((9+9)-(8-0))=10
((9-(0-9))-8)=10
((9-(8-9))-0)=10
((9-0)+(9-8))=10
((9-0)-(8-9))=10
((9-8)+(0+9))=10
((9-8)+(9-0))=10
((9-8)-(0-9))=10
(0+((9+9)-8))=10
(0+(9+(9-8)))=10
(0+(9-(8-9)))=10
(0-((8-9)-9))=10
(0-(8-(9+9)))=10
(9+((0+9)-8))=10
(9+((9-0)-8))=10
(9+((9-8)-0))=10
(9+(0+(9-8)))=10
(9+(0-(8-9)))=10
(9+(9+(0-8)))=10
(9+(9-(0+8)))=10
(9+(9-(8-0)))=10
(9-((0+8)-9))=10
(9-((8-0)-9))=10
(9-((8-9)-0))=10
(9-(0+(8-9)))=10
(9-(0-(9-8)))=10
(9-(8+(0-9)))=10
(9-(8-(0+9)))=10
(9-(8-(9-0)))=10