(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。
((2×(8-2))-2)=10
((2×2)+(8-2))=10
((2×2)-(2-8))=10
((2+(2+8))-2)=10
((2+2)+(8-2))=10
((2+2)-(2-8))=10
((2+8)×(2÷2))=10
((2+8)+(2-2))=10
((2+8)-(2-2))=10
((2+8)÷(2÷2))=10
((2-2)+(2+8))=10
((2÷2)×(2+8))=10
((8+(2×2))-2)=10
((8+(2+2))-2)=10
((8-2)+(2×2))=10
((8-2)+(2+2))=10
(2×((2+8)÷2))=10
(2+((2×8)÷2))=10
(2+((2+8)-2))=10
(2+(2×(8÷2)))=10
(2+(2+(8-2)))=10
(2+(2-(2-8)))=10
(2+(2÷(2÷8)))=10
(2+(8×(2÷2)))=10
(2+(8+(2-2)))=10
(2+(8-(2-2)))=10
(2+(8÷(2÷2)))=10
(2-((2-2)-8))=10
(2-((2-8)-2))=10
(2-(2-(2+8)))=10
(2÷(2÷(2+8)))=10
(8+((2×2)-2))=10
(8+((2×2)÷2))=10
(8+((2+2)-2))=10
(8+((2+2)÷2))=10
(8+(2×(2÷2)))=10
(8+(2+(2-2)))=10
(8+(2-(2-2)))=10
(8+(2÷(2÷2)))=10
(8-((2-2)-2))=10
(8-(2-(2×2)))=10
(8-(2-(2+2)))=10