（ただし１と２を合せて１２のような使い方は出来ません。）
72個の解法が見つかりました。
(((3+9)÷1)-2)=10
((1×(3+9))-2)=10
((1×3)+(9-2))=10
((1×3)-(2-9))=10
((1×9)+(3-2))=10
((1×9)-(2-3))=10
((1+9)×(3-2))=10
((1+9)÷(3-2))=10
((3+(1×9))-2)=10
((3+(9-2))÷1)=10
((3+(9÷1))-2)=10
((3+9)-(1×2))=10
((3+9)-(2÷1))=10
((3-(2-9))÷1)=10
((3-2)×(1+9))=10
((3-2)+(1×9))=10
((3-2)+(9÷1))=10
((3÷1)+(9-2))=10
((3÷1)-(2-9))=10
((9+(1×3))-2)=10
((9+(3-2))÷1)=10
((9+(3÷1))-2)=10
((9-(2-3))÷1)=10
((9-2)+(1×3))=10
((9-2)+(3÷1))=10
((9÷1)+(3-2))=10
((9÷1)-(2-3))=10
(1×((3+9)-2))=10
(1×(3+(9-2)))=10
(1×(3-(2-9)))=10
(1×(9+(3-2)))=10
(1×(9-(2-3)))=10
(1+(9×(3-2)))=10
(1+(9÷(3-2)))=10
(1-(9×(2-3)))=10
(1-(9÷(2-3)))=10
(2×((9-1)-3))=10
(2×((9-3)-1))=10
(2×(9-(1+3)))=10
(3+((1×9)-2))=10
(3+((9-2)÷1))=10
(3+((9÷1)-2))=10
(3+(1×(9-2)))=10
(3+(9-(1×2)))=10
(3+(9-(2÷1)))=10
(3-((1×2)-9))=10
(3-((2-9)÷1))=10
(3-((2÷1)-9))=10
(3-(1×(2-9)))=10
(3-(2-(1×9)))=10
(3-(2-(9÷1)))=10
(9+((1×3)-2))=10
(9+((1+2)÷3))=10
(9+((3-1)÷2))=10
(9+((3-2)÷1))=10
(9+((3÷1)-2))=10
(9+(1×(3-2)))=10
(9+(1÷(3-2)))=10
(9+(2÷(3-1)))=10
(9+(3-(1×2)))=10
(9+(3-(2÷1)))=10
(9+(3÷(1+2)))=10
(9-((1×2)-3))=10
(9-((1-3)÷2))=10
(9-((2-3)÷1))=10
(9-((2÷1)-3))=10
(9-(1×(2-3)))=10
(9-(1÷(2-3)))=10
(9-(2-(1×3)))=10
(9-(2-(3÷1)))=10
(9-(2÷(1-3)))=10