（ただし１と２を合せて１２のような使い方は出来ません。）
49個の解法が見つかりました。
(((7+9)-5)-1)=10
((1×5)×(9-7))=10
((5×(9-7))÷1)=10
((5÷1)×(9-7))=10
((7+(9-1))-5)=10
((7+(9-5))-1)=10
((7+9)-(1+5))=10
((7-(1-9))-5)=10
((7-(5-9))-1)=10
((7-1)+(9-5))=10
((7-1)-(5-9))=10
((7-5)+(9-1))=10
((7-5)-(1-9))=10
((9+(7-1))-5)=10
((9+(7-5))-1)=10
((9-(1-7))-5)=10
((9-(5-7))-1)=10
((9-1)+(7-5))=10
((9-1)-(5-7))=10
((9-5)+(7-1))=10
((9-5)-(1-7))=10
((9-7)×(1×5))=10
((9-7)×(5÷1))=10
((9-7)÷(1÷5))=10
(1×(5×(9-7)))=10
(5×((1×9)-7))=10
(5×((9-7)÷1))=10
(5×((9÷1)-7))=10
(5×(1×(9-7)))=10
(5×(9-(1×7)))=10
(5×(9-(7÷1)))=10
(5÷(1÷(9-7)))=10
(7+((9-1)-5))=10
(7+((9-5)-1))=10
(7+(9-(1+5)))=10
(7-((1+5)-9))=10
(7-(1+(5-9)))=10
(7-(1-(9-5)))=10
(7-(5+(1-9)))=10
(7-(5-(9-1)))=10
(9+((7-1)-5))=10
(9+((7-5)-1))=10
(9+(7-(1+5)))=10
(9-((1+5)-7))=10
(9-(1+(5-7)))=10
(9-(1-(7-5)))=10
(9-(5+(1-7)))=10
(9-(5-(7-1)))=10