（ただし１と２を合せて１２のような使い方は出来ません。）
61個の解法が見つかりました。
((1+(3+9))-3)=10
((1+3)+(9-3))=10
((1+3)-(3-9))=10
((1+9)×(3÷3))=10
((1+9)+(3-3))=10
((1+9)-(3-3))=10
((1+9)÷(3÷3))=10
((1-3)+(3+9))=10
((3×(1+9))÷3)=10
((3+(1+9))-3)=10
((3+9)+(1-3))=10
((3+9)-(3-1))=10
((3-3)+(1+9))=10
((3÷3)×(1+9))=10
((3÷3)+(1×9))=10
((3÷3)+(9÷1))=10
((9+(1+3))-3)=10
((9+(3÷3))÷1)=10
((9-3)+(1+3))=10
((9÷1)+(3÷3))=10
(1×(9+(3÷3)))=10
(1+((3×9)÷3))=10
(1+((3+9)-3))=10
(1+(3×(9÷3)))=10
(1+(3+(9-3)))=10
(1+(3-(3-9)))=10
(1+(3÷(3÷9)))=10
(1+(9×(3÷3)))=10
(1+(9+(3-3)))=10
(1+(9-(3-3)))=10
(1+(9÷(3÷3)))=10
(1-((3-3)-9))=10
(1-((3-9)-3))=10
(1-(3-(3+9)))=10
(3×((1+9)÷3))=10
(3+((1+9)-3))=10
(3+(1+(9-3)))=10
(3+(1-(3-9)))=10
(3+(9+(1-3)))=10
(3+(9-(3-1)))=10
(3-((3-1)-9))=10
(3-((3-9)-1))=10
(3-(3-(1+9)))=10
(3÷(3÷(1+9)))=10
(9+((1×3)÷3))=10
(9+((1+3)-3))=10
(9+((3÷1)÷3))=10
(9+((3÷3)÷1))=10
(9+(1×(3÷3)))=10
(9+(1+(3-3)))=10
(9+(1-(3-3)))=10
(9+(1÷(3÷3)))=10
(9+(3×(1÷3)))=10
(9+(3+(1-3)))=10
(9+(3-(3-1)))=10
(9+(3÷(1×3)))=10
(9+(3÷(3÷1)))=10
(9-((3-1)-3))=10
(9-((3-3)-1))=10
(9-(3-(1+3)))=10