（ただし１と２を合せて１２のような使い方は出来ません。）
78個の解法が見つかりました。
(((4×5)-9)-1)=10
(((5+9)-4)÷1)=10
(((5+9)÷1)-4)=10
((1×(5+9))-4)=10
((1×5)+(9-4))=10
((1×5)-(4-9))=10
((1×9)+(5-4))=10
((1×9)-(4-5))=10
((1+9)×(5-4))=10
((1+9)÷(5-4))=10
((4×5)-(1+9))=10
((5×(9-1))÷4)=10
((5+(1×9))-4)=10
((5+(9-4))÷1)=10
((5+(9÷1))-4)=10
((5+9)-(1×4))=10
((5+9)-(4÷1))=10
((5-(4-9))÷1)=10
((5-4)×(1+9))=10
((5-4)+(1×9))=10
((5-4)+(9÷1))=10
((5÷1)+(9-4))=10
((5÷1)-(4-9))=10
((5÷4)×(9-1))=10
((9+(1×5))-4)=10
((9+(5-4))÷1)=10
((9+(5÷1))-4)=10
((9-(4-5))÷1)=10
((9-1)×(5÷4))=10
((9-1)÷(4÷5))=10
((9-4)+(1×5))=10
((9-4)+(5÷1))=10
((9÷1)+(5-4))=10
((9÷1)-(4-5))=10
(1×((5+9)-4))=10
(1×(5+(9-4)))=10
(1×(5-(4-9)))=10
(1×(9+(5-4)))=10
(1×(9-(4-5)))=10
(1+(9×(5-4)))=10
(1+(9÷(5-4)))=10
(1-(9×(4-5)))=10
(1-(9÷(4-5)))=10
(5×((9-1)÷4))=10
(5+((1×9)-4))=10
(5+((9-4)÷1))=10
(5+((9÷1)-4))=10
(5+(1×(9-4)))=10
(5+(9-(1×4)))=10
(5+(9-(4÷1)))=10
(5-((1×4)-9))=10
(5-((4-9)÷1))=10
(5-((4÷1)-9))=10
(5-(1×(4-9)))=10
(5-(4-(1×9)))=10
(5-(4-(9÷1)))=10
(5÷(4÷(9-1)))=10
(9+((1×5)-4))=10
(9+((1+4)÷5))=10
(9+((5-1)÷4))=10
(9+((5-4)÷1))=10
(9+((5÷1)-4))=10
(9+(1×(5-4)))=10
(9+(1÷(5-4)))=10
(9+(4÷(5-1)))=10
(9+(5-(1×4)))=10
(9+(5-(4÷1)))=10
(9+(5÷(1+4)))=10
(9-((1×4)-5))=10
(9-((1-5)÷4))=10
(9-((4-5)÷1))=10
(9-((4÷1)-5))=10
(9-(1×(4-5)))=10
(9-(1÷(4-5)))=10
(9-(4-(1×5)))=10
(9-(4-(5÷1)))=10
(9-(4÷(1-5)))=10