（ただし１と２を合せて１２のような使い方は出来ません。）
52個の解法が見つかりました。
((4+6)×(9÷9))=10
((4+6)+(9-9))=10
((4+6)-(9-9))=10
((4+6)÷(9÷9))=10
((4+9)+(6-9))=10
((4+9)-(9-6))=10
((4-9)+(6+9))=10
((6+(4+9))-9)=10
((6+9)+(4-9))=10
((6+9)-(9-4))=10
((6-9)+(4+9))=10
((9×(4+6))÷9)=10
((9+(4+6))-9)=10
((9-9)+(4+6))=10
((9÷9)×(4+6))=10
(4+((6×9)÷9))=10
(4+((6+9)-9))=10
(4+(6×(9÷9)))=10
(4+(6+(9-9)))=10
(4+(6-(9-9)))=10
(4+(6÷(9÷9)))=10
(4+(9×(6÷9)))=10
(4+(9+(6-9)))=10
(4+(9-(9-6)))=10
(4+(9÷(9÷6)))=10
(4-((9-6)-9))=10
(4-((9-9)-6))=10
(4-(9-(6+9)))=10
(6+((4×9)÷9))=10
(6+((4+9)-9))=10
(6+(4×(9÷9)))=10
(6+(4+(9-9)))=10
(6+(4-(9-9)))=10
(6+(4÷(9÷9)))=10
(6+(9×(4÷9)))=10
(6+(9+(4-9)))=10
(6+(9-(9-4)))=10
(6+(9÷(9÷4)))=10
(6-((9-4)-9))=10
(6-((9-9)-4))=10
(6-(9-(4+9)))=10
(9×((4+6)÷9))=10
(9+((4+6)-9))=10
(9+(4+(6-9)))=10
(9+(4-(9-6)))=10
(9+(6+(4-9)))=10
(9+(6-(9-4)))=10
(9-((9-4)-6))=10
(9-((9-6)-4))=10
(9-(9-(4+6)))=10
(9÷(9÷(4+6)))=10