(ただし1と2を合せて12のような使い方は出来ません。)
32個の解法が見つかりました。
((5+5)×(8÷8))=10
((5+5)+(8-8))=10
((5+5)-(8-8))=10
((5+5)÷(8÷8))=10
((5+8)+(5-8))=10
((5+8)-(8-5))=10
((5-8)+(5+8))=10
((8×(5+5))÷8)=10
((8+(5+5))-8)=10
((8-8)+(5+5))=10
((8÷8)×(5+5))=10
(5+((5×8)÷8))=10
(5+((5+8)-8))=10
(5+(5×(8÷8)))=10
(5+(5+(8-8)))=10
(5+(5-(8-8)))=10
(5+(5÷(8÷8)))=10
(5+(8×(5÷8)))=10
(5+(8+(5-8)))=10
(5+(8-(8-5)))=10
(5+(8÷(8÷5)))=10
(5-((8-5)-8))=10
(5-((8-8)-5))=10
(5-(8-(5+8)))=10
(8×((5+5)÷8))=10
(8+((5+5)-8))=10
(8+(5+(5-8)))=10
(8+(5-(8-5)))=10
(8-((8-5)-5))=10
(8-(8-(5+5)))=10
(8÷(8÷(5+5)))=10