(ただし1と2を合せて12のような使い方は出来ません。)
22個の解法が見つかりました。
(((8+8)-5)-1)=10
((8+(8-1))-5)=10
((8+(8-5))-1)=10
((8+8)-(1+5))=10
((8-(1-8))-5)=10
((8-(5-8))-1)=10
((8-1)+(8-5))=10
((8-1)-(5-8))=10
((8-5)+(8-1))=10
((8-5)-(1-8))=10
(5×(1+(8÷8)))=10
(8+((8-1)-5))=10
(8+((8-5)-1))=10
(8+(8-(1+5)))=10
(8+(8÷(5-1)))=10
(8-((1+5)-8))=10
(8-(1+(5-8)))=10
(8-(1-(8-5)))=10
(8-(5+(1-8)))=10
(8-(5-(8-1)))=10
(8-(8÷(1-5)))=10