（ただし１と２を合せて１２のような使い方は出来ません。）
81個の解法が見つかりました。
((1×(2+8))÷1)=10
((1×1)×(2+8))=10
((1×2)+(1×8))=10
((1×2)+(8÷1))=10
((1×8)+(1×2))=10
((1×8)+(2÷1))=10
((1+(2+8))-1)=10
((1+2)+(8-1))=10
((1+2)-(1-8))=10
((1+8)+(2-1))=10
((1+8)-(1-2))=10
((1-1)+(2+8))=10
((1÷1)×(2+8))=10
((2+(1×8))÷1)=10
((2+(1+8))-1)=10
((2+(8÷1))÷1)=10
((2+8)×(1×1))=10
((2+8)×(1÷1))=10
((2+8)+(1-1))=10
((2+8)-(1-1))=10
((2+8)÷(1×1))=10
((2+8)÷(1÷1))=10
((2-1)+(1+8))=10
((2÷1)+(1×8))=10
((2÷1)+(8÷1))=10
((8+(1×2))÷1)=10
((8+(1+2))-1)=10
((8+(2÷1))÷1)=10
((8-1)+(1+2))=10
((8÷1)+(1×2))=10
((8÷1)+(2÷1))=10
(1×((2+8)÷1))=10
(1×(1×(2+8)))=10
(1×(2+(1×8)))=10
(1×(2+(8÷1)))=10
(1×(8+(1×2)))=10
(1×(8+(2÷1)))=10
(1+((2+8)-1))=10
(1+(2+(8-1)))=10
(1+(2-(1-8)))=10
(1+(8+(2-1)))=10
(1+(8-(1-2)))=10
(1-((1-2)-8))=10
(1-((1-8)-2))=10
(1-(1-(2+8)))=10
(1÷(1÷(2+8)))=10
(2+((1×8)÷1))=10
(2+((1+8)-1))=10
(2+((8÷1)÷1))=10
(2+(1×(1×8)))=10
(2+(1×(8÷1)))=10
(2+(1+(8-1)))=10
(2+(1-(1-8)))=10
(2+(1÷(1÷8)))=10
(2+(8×(1×1)))=10
(2+(8×(1÷1)))=10
(2+(8+(1-1)))=10
(2+(8-(1-1)))=10
(2+(8÷(1×1)))=10
(2+(8÷(1÷1)))=10
(2-((1-1)-8))=10
(2-((1-8)-1))=10
(2-(1-(1+8)))=10
(8+((1×2)÷1))=10
(8+((1+2)-1))=10
(8+((2÷1)÷1))=10
(8+(1×(1×2)))=10
(8+(1×(2÷1)))=10
(8+(1+(2-1)))=10
(8+(1-(1-2)))=10
(8+(1÷(1÷2)))=10
(8+(2×(1×1)))=10
(8+(2×(1÷1)))=10
(8+(2+(1-1)))=10
(8+(2-(1-1)))=10
(8+(2÷(1×1)))=10
(8+(2÷(1÷1)))=10
(8-((1-1)-2))=10
(8-((1-2)-1))=10
(8-(1-(1+2)))=10