（ただし１と２を合せて１２のような使い方は出来ません。）
61個の解法が見つかりました。
((1+(4+9))-4)=10
((1+4)+(9-4))=10
((1+4)-(4-9))=10
((1+9)×(4÷4))=10
((1+9)+(4-4))=10
((1+9)-(4-4))=10
((1+9)÷(4÷4))=10
((1-4)+(4+9))=10
((4×(1+9))÷4)=10
((4+(1+9))-4)=10
((4+9)+(1-4))=10
((4+9)-(4-1))=10
((4-4)+(1+9))=10
((4÷4)×(1+9))=10
((4÷4)+(1×9))=10
((4÷4)+(9÷1))=10
((9+(1+4))-4)=10
((9+(4÷4))÷1)=10
((9-4)+(1+4))=10
((9÷1)+(4÷4))=10
(1×(9+(4÷4)))=10
(1+((4×9)÷4))=10
(1+((4+9)-4))=10
(1+(4×(9÷4)))=10
(1+(4+(9-4)))=10
(1+(4-(4-9)))=10
(1+(4÷(4÷9)))=10
(1+(9×(4÷4)))=10
(1+(9+(4-4)))=10
(1+(9-(4-4)))=10
(1+(9÷(4÷4)))=10
(1-((4-4)-9))=10
(1-((4-9)-4))=10
(1-(4-(4+9)))=10
(4×((1+9)÷4))=10
(4+((1+9)-4))=10
(4+(1+(9-4)))=10
(4+(1-(4-9)))=10
(4+(9+(1-4)))=10
(4+(9-(4-1)))=10
(4-((4-1)-9))=10
(4-((4-9)-1))=10
(4-(4-(1+9)))=10
(4÷(4÷(1+9)))=10
(9+((1×4)÷4))=10
(9+((1+4)-4))=10
(9+((4÷1)÷4))=10
(9+((4÷4)÷1))=10
(9+(1×(4÷4)))=10
(9+(1+(4-4)))=10
(9+(1-(4-4)))=10
(9+(1÷(4÷4)))=10
(9+(4×(1÷4)))=10
(9+(4+(1-4)))=10
(9+(4-(4-1)))=10
(9+(4÷(1×4)))=10
(9+(4÷(4÷1)))=10
(9-((4-1)-4))=10
(9-((4-4)-1))=10
(9-(4-(1+4)))=10