（ただし１と２を合せて１２のような使い方は出来ません。）
59個の解法が見つかりました。
(((7+8)÷1)-5)=10
((1×(7+8))-5)=10
((1×7)+(8-5))=10
((1×7)-(5-8))=10
((1×8)+(7-5))=10
((1×8)-(5-7))=10
((7+(1×8))-5)=10
((7+(8-5))÷1)=10
((7+(8÷1))-5)=10
((7+8)-(1×5))=10
((7+8)-(5÷1))=10
((7-(5-8))÷1)=10
((7-5)+(1×8))=10
((7-5)+(8÷1))=10
((7÷1)+(8-5))=10
((7÷1)-(5-8))=10
((8+(1×7))-5)=10
((8+(7-5))÷1)=10
((8+(7÷1))-5)=10
((8-(5-7))÷1)=10
((8-5)+(1×7))=10
((8-5)+(7÷1))=10
((8÷1)+(7-5))=10
((8÷1)-(5-7))=10
(1×((7+8)-5))=10
(1×(7+(8-5)))=10
(1×(7-(5-8)))=10
(1×(8+(7-5)))=10
(1×(8-(5-7)))=10
(5×((1+8)-7))=10
(5×(1+(8-7)))=10
(5×(1-(7-8)))=10
(5×(8+(1-7)))=10
(5×(8-(7-1)))=10
(7+((1×8)-5))=10
(7+((8-5)÷1))=10
(7+((8÷1)-5))=10
(7+(1×(8-5)))=10
(7+(8-(1×5)))=10
(7+(8-(5÷1)))=10
(7-((1×5)-8))=10
(7-((5-8)÷1))=10
(7-((5÷1)-8))=10
(7-(1×(5-8)))=10
(7-(5-(1×8)))=10
(7-(5-(8÷1)))=10
(8+((1×7)-5))=10
(8+((7-5)÷1))=10
(8+((7÷1)-5))=10
(8+(1×(7-5)))=10
(8+(7-(1×5)))=10
(8+(7-(5÷1)))=10
(8-((1×5)-7))=10
(8-((5-7)÷1))=10
(8-((5÷1)-7))=10
(8-(1×(5-7)))=10
(8-(5-(1×7)))=10
(8-(5-(7÷1)))=10