（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+4)+(7-4))=10
((3+4)-(4-7))=10
((3+7)×(4÷4))=10
((3+7)+(4-4))=10
((3+7)-(4-4))=10
((3+7)÷(4÷4))=10
((3-4)+(4+7))=10
((4×(3+7))÷4)=10
((4+(3+7))-4)=10
((4+7)+(3-4))=10
((4+7)-(4-3))=10
((4-4)+(3+7))=10
((4÷4)×(3+7))=10
((7+(3+4))-4)=10
((7-4)+(3+4))=10
(3+((4×7)÷4))=10
(3+((4+7)-4))=10
(3+(4×(7÷4)))=10
(3+(4+(7-4)))=10
(3+(4-(4-7)))=10
(3+(4÷(4÷7)))=10
(3+(7×(4÷4)))=10
(3+(7+(4-4)))=10
(3+(7-(4-4)))=10
(3+(7÷(4÷4)))=10
(3-((4-4)-7))=10
(3-((4-7)-4))=10
(3-(4-(4+7)))=10
(4×((3+7)÷4))=10
(4+((3+7)-4))=10
(4+(3+(7-4)))=10
(4+(3-(4-7)))=10
(4+(7+(3-4)))=10
(4+(7-(4-3)))=10
(4-((4-3)-7))=10
(4-((4-7)-3))=10
(4-(4-(3+7)))=10
(4÷(4÷(3+7)))=10
(7+((3×4)÷4))=10
(7+((3+4)-4))=10
(7+(3×(4÷4)))=10
(7+(3+(4-4)))=10
(7+(3-(4-4)))=10
(7+(3÷(4÷4)))=10
(7+(4×(3÷4)))=10
(7+(4+(3-4)))=10
(7+(4-(4-3)))=10
(7+(4÷(4÷3)))=10
(7-((4-3)-4))=10
(7-((4-4)-3))=10
(7-(4-(3+4)))=10