（ただし１と２を合せて１２のような使い方は出来ません。）
74個の解法が見つかりました。
(((4+8)÷1)-2)=10
((1×(4+8))-2)=10
((1×4)+(8-2))=10
((1×4)-(2-8))=10
((1×8)+(4-2))=10
((1×8)+(4÷2))=10
((1×8)-(2-4))=10
((2×(8-1))-4)=10
((4+(1×8))-2)=10
((4+(8-2))÷1)=10
((4+(8÷1))-2)=10
((4+8)-(1×2))=10
((4+8)-(2÷1))=10
((4-(2-8))÷1)=10
((4-2)+(1×8))=10
((4-2)+(8÷1))=10
((4÷1)+(8-2))=10
((4÷1)-(2-8))=10
((4÷2)+(1×8))=10
((4÷2)+(8÷1))=10
((8+(1×4))-2)=10
((8+(4-2))÷1)=10
((8+(4÷1))-2)=10
((8+(4÷2))÷1)=10
((8-(2-4))÷1)=10
((8-2)+(1×4))=10
((8-2)+(4÷1))=10
((8÷1)+(4-2))=10
((8÷1)+(4÷2))=10
((8÷1)-(2-4))=10
(1×((4+8)-2))=10
(1×(4+(8-2)))=10
(1×(4-(2-8)))=10
(1×(8+(4-2)))=10
(1×(8+(4÷2)))=10
(1×(8-(2-4)))=10
(2×((1+8)-4))=10
(2×(1+(8-4)))=10
(2×(1-(4-8)))=10
(2×(8+(1-4)))=10
(2×(8-(4-1)))=10
(4+((1×8)-2))=10
(4+((8-2)÷1))=10
(4+((8÷1)-2))=10
(4+(1×(8-2)))=10
(4+(8-(1×2)))=10
(4+(8-(2÷1)))=10
(4-((1×2)-8))=10
(4-((2-8)÷1))=10
(4-((2÷1)-8))=10
(4-(1×(2-8)))=10
(4-(2-(1×8)))=10
(4-(2-(8÷1)))=10
(8+((1×4)-2))=10
(8+((1×4)÷2))=10
(8+((4-2)÷1))=10
(8+((4÷1)-2))=10
(8+((4÷1)÷2))=10
(8+((4÷2)÷1))=10
(8+(1×(4-2)))=10
(8+(1×(4÷2)))=10
(8+(1÷(2÷4)))=10
(8+(4×(1÷2)))=10
(8+(4-(1×2)))=10
(8+(4-(2÷1)))=10
(8+(4÷(1×2)))=10
(8+(4÷(2÷1)))=10
(8-((1×2)-4))=10
(8-((2-4)÷1))=10
(8-((2÷1)-4))=10
(8-(1×(2-4)))=10
(8-(2-(1×4)))=10
(8-(2-(4÷1)))=10