（ただし１と２を合せて１２のような使い方は出来ません。）
81個の解法が見つかりました。
((1×(3+7))÷1)=10
((1×1)×(3+7))=10
((1×3)+(1×7))=10
((1×3)+(7÷1))=10
((1×7)+(1×3))=10
((1×7)+(3÷1))=10
((1+(3+7))-1)=10
((1+3)+(7-1))=10
((1+3)-(1-7))=10
((1+7)+(3-1))=10
((1+7)-(1-3))=10
((1-1)+(3+7))=10
((1÷1)×(3+7))=10
((3+(1×7))÷1)=10
((3+(1+7))-1)=10
((3+(7÷1))÷1)=10
((3+7)×(1×1))=10
((3+7)×(1÷1))=10
((3+7)+(1-1))=10
((3+7)-(1-1))=10
((3+7)÷(1×1))=10
((3+7)÷(1÷1))=10
((3-1)+(1+7))=10
((3÷1)+(1×7))=10
((3÷1)+(7÷1))=10
((7+(1×3))÷1)=10
((7+(1+3))-1)=10
((7+(3÷1))÷1)=10
((7-1)+(1+3))=10
((7÷1)+(1×3))=10
((7÷1)+(3÷1))=10
(1×((3+7)÷1))=10
(1×(1×(3+7)))=10
(1×(3+(1×7)))=10
(1×(3+(7÷1)))=10
(1×(7+(1×3)))=10
(1×(7+(3÷1)))=10
(1+((3+7)-1))=10
(1+(3+(7-1)))=10
(1+(3-(1-7)))=10
(1+(7+(3-1)))=10
(1+(7-(1-3)))=10
(1-((1-3)-7))=10
(1-((1-7)-3))=10
(1-(1-(3+7)))=10
(1÷(1÷(3+7)))=10
(3+((1×7)÷1))=10
(3+((1+7)-1))=10
(3+((7÷1)÷1))=10
(3+(1×(1×7)))=10
(3+(1×(7÷1)))=10
(3+(1+(7-1)))=10
(3+(1-(1-7)))=10
(3+(1÷(1÷7)))=10
(3+(7×(1×1)))=10
(3+(7×(1÷1)))=10
(3+(7+(1-1)))=10
(3+(7-(1-1)))=10
(3+(7÷(1×1)))=10
(3+(7÷(1÷1)))=10
(3-((1-1)-7))=10
(3-((1-7)-1))=10
(3-(1-(1+7)))=10
(7+((1×3)÷1))=10
(7+((1+3)-1))=10
(7+((3÷1)÷1))=10
(7+(1×(1×3)))=10
(7+(1×(3÷1)))=10
(7+(1+(3-1)))=10
(7+(1-(1-3)))=10
(7+(1÷(1÷3)))=10
(7+(3×(1×1)))=10
(7+(3×(1÷1)))=10
(7+(3+(1-1)))=10
(7+(3-(1-1)))=10
(7+(3÷(1×1)))=10
(7+(3÷(1÷1)))=10
(7-((1-1)-3))=10
(7-((1-3)-1))=10
(7-(1-(1+3)))=10