（ただし１と２を合せて１２のような使い方は出来ません。）
53個の解法が見つかりました。
((2+5)+(8-5))=10
((2+5)-(5-8))=10
((2+8)×(5÷5))=10
((2+8)+(5-5))=10
((2+8)-(5-5))=10
((2+8)÷(5÷5))=10
((2-5)+(5+8))=10
((5×(2+8))÷5)=10
((5+(2+8))-5)=10
((5+8)+(2-5))=10
((5+8)-(5-2))=10
((5-5)+(2+8))=10
((5÷5)×(2+8))=10
((8+(2+5))-5)=10
((8-5)+(2+5))=10
(2+((5×8)÷5))=10
(2+((5+8)-5))=10
(2+(5×(8÷5)))=10
(2+(5+(8-5)))=10
(2+(5-(5-8)))=10
(2+(5÷(5÷8)))=10
(2+(8×(5÷5)))=10
(2+(8+(5-5)))=10
(2+(8-(5-5)))=10
(2+(8÷(5÷5)))=10
(2-((5-5)-8))=10
(2-((5-8)-5))=10
(2-(5-(5+8)))=10
(5×((2×5)-8))=10
(5×((2+8)÷5))=10
(5+((2+8)-5))=10
(5+(2+(8-5)))=10
(5+(2-(5-8)))=10
(5+(8+(2-5)))=10
(5+(8-(5-2)))=10
(5-((5-2)-8))=10
(5-((5-8)-2))=10
(5-(5-(2+8)))=10
(5÷(5÷(2+8)))=10
(8+((2×5)÷5))=10
(8+((2+5)-5))=10
(8+(2×(5÷5)))=10
(8+(2+(5-5)))=10
(8+(2-(5-5)))=10
(8+(2÷(5÷5)))=10
(8+(5×(2÷5)))=10
(8+(5+(2-5)))=10
(8+(5-(5-2)))=10
(8+(5÷(5÷2)))=10
(8-((5-2)-5))=10
(8-((5-5)-2))=10
(8-(5-(2+5)))=10