（ただし１と２を合せて１２のような使い方は出来ません。）
43個の解法が見つかりました。
((1×4)+(1+5))=10
((1×5)+(1+4))=10
((1+(4+5))÷1)=10
((1+4)+(1×5))=10
((1+4)+(5÷1))=10
((1+5)+(1×4))=10
((1+5)+(4÷1))=10
((1÷1)+(4+5))=10
((4×5)÷(1+1))=10
((4+(1+5))÷1)=10
((4+5)+(1×1))=10
((4+5)+(1÷1))=10
((4÷1)+(1+5))=10
((5+(1+4))÷1)=10
((5÷1)+(1+4))=10
(1×(1+(4+5)))=10
(1×(4+(1+5)))=10
(1×(5+(1+4)))=10
(1+((4+5)÷1))=10
(1+(1×(4+5)))=10
(1+(4+(1×5)))=10
(1+(4+(5÷1)))=10
(1+(5+(1×4)))=10
(1+(5+(4÷1)))=10
(4×(5÷(1+1)))=10
(4+((1+5)÷1))=10
(4+(1×(1+5)))=10
(4+(1+(1×5)))=10
(4+(1+(5÷1)))=10
(4+(5+(1×1)))=10
(4+(5+(1÷1)))=10
(4÷((1+1)÷5))=10
(5×((4-1)-1))=10
(5×(4-(1+1)))=10
(5×(4÷(1+1)))=10
(5+((1+4)÷1))=10
(5+(1×(1+4)))=10
(5+(1+(1×4)))=10
(5+(1+(4÷1)))=10
(5+(4+(1×1)))=10
(5+(4+(1÷1)))=10
(5÷((1+1)÷4))=10