（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。
((3+7)×(9÷9))=10
((3+7)+(9-9))=10
((3+7)-(9-9))=10
((3+7)÷(9÷9))=10
((3+9)+(7-9))=10
((3+9)-(9-7))=10
((3-9)+(7+9))=10
((7+(3+9))-9)=10
((7+9)+(3-9))=10
((7+9)-(9-3))=10
((7-9)+(3+9))=10
((9×(3+7))÷9)=10
((9+(3+7))-9)=10
((9-9)+(3+7))=10
((9÷9)×(3+7))=10
(3+((7×9)÷9))=10
(3+((7+9)-9))=10
(3+(7×(9÷9)))=10
(3+(7+(9-9)))=10
(3+(7-(9-9)))=10
(3+(7÷(9÷9)))=10
(3+(9×(7÷9)))=10
(3+(9+(7-9)))=10
(3+(9-(9-7)))=10
(3+(9÷(9÷7)))=10
(3-((9-7)-9))=10
(3-((9-9)-7))=10
(3-(9-(7+9)))=10
(7+((3×9)÷9))=10
(7+((3+9)-9))=10
(7+(3×(9÷9)))=10
(7+(3+(9-9)))=10
(7+(3-(9-9)))=10
(7+(3÷(9÷9)))=10
(7+(9×(3÷9)))=10
(7+(9+(3-9)))=10
(7+(9-(9-3)))=10
(7+(9÷(9÷3)))=10
(7-((9-3)-9))=10
(7-((9-9)-3))=10
(7-(9-(3+9)))=10
(9×((3+7)÷9))=10
(9+((3+7)-9))=10
(9+(3+(7-9)))=10
(9+(3-(9-7)))=10
(9+(7+(3-9)))=10
(9+(7-(9-3)))=10
(9-((9-3)-7))=10
(9-((9-7)-3))=10
(9-(9-(3+7)))=10
(9÷(9÷(3+7)))=10