（ただし１と２を合せて１２のような使い方は出来ません。）
69個の解法が見つかりました。
((2+(4×4))-8)=10
((2+(4+8))-4)=10
((2+4)+(8-4))=10
((2+4)-(4-8))=10
((2+8)×(4÷4))=10
((2+8)+(4-4))=10
((2+8)-(4-4))=10
((2+8)÷(4÷4))=10
((2-4)+(4+8))=10
((2-8)+(4×4))=10
((4×(2+8))÷4)=10
((4×4)+(2-8))=10
((4×4)-(8-2))=10
((4+(2+8))-4)=10
((4+8)+(2-4))=10
((4+8)-(4-2))=10
((4+8)-(4÷2))=10
((4-4)+(2+8))=10
((4÷4)×(2+8))=10
((8+(2+4))-4)=10
((8-4)+(2+4))=10
((8÷4)+(2×4))=10
(2+((4×4)-8))=10
(2+((4×8)÷4))=10
(2+((4+8)-4))=10
(2+(4×(8÷4)))=10
(2+(4+(8-4)))=10
(2+(4-(4-8)))=10
(2+(4÷(4÷8)))=10
(2+(8×(4÷4)))=10
(2+(8+(4-4)))=10
(2+(8-(4-4)))=10
(2+(8÷(4÷4)))=10
(2-((4-4)-8))=10
(2-((4-8)-4))=10
(2-(4-(4+8)))=10
(2-(8-(4×4)))=10
(4×((2+8)÷4))=10
(4×(2+(4÷8)))=10
(4+((2+8)-4))=10
(4+((4+8)÷2))=10
(4+(2+(8-4)))=10
(4+(2-(4-8)))=10
(4+(8+(2-4)))=10
(4+(8-(4-2)))=10
(4+(8-(4÷2)))=10
(4-((4-2)-8))=10
(4-((4-8)-2))=10
(4-((4÷2)-8))=10
(4-(4-(2+8)))=10
(4÷(4÷(2+8)))=10
(8+((2×4)÷4))=10
(8+((2+4)-4))=10
(8+(2×(4÷4)))=10
(8+(2+(4-4)))=10
(8+(2-(4-4)))=10
(8+(2÷(4÷4)))=10
(8+(4×(2÷4)))=10
(8+(4+(2-4)))=10
(8+(4-(4-2)))=10
(8+(4-(4÷2)))=10
(8+(4÷(4-2)))=10
(8+(4÷(4÷2)))=10
(8-((4-2)-4))=10
(8-((4-4)-2))=10
(8-((4÷2)-4))=10
(8-(4-(2+4)))=10
(8-(4÷(2-4)))=10