(ただし1と2を合せて12のような使い方は出来ません。)
19個の解法が見つかりました。
((3×4)-(9-7))=10
((7+(3×4))-9)=10
((7-9)+(3×4))=10
(4+(3×(9-7)))=10
(4-(3×(7-9)))=10
(7+((3×4)-9))=10
(7+((3+9)÷4))=10
(7-(9-(3×4)))=10
(9+((3+4)÷7))=10
(9+((7-3)÷4))=10
(9+((7-4)÷3))=10
(9+(3÷(7-4)))=10
(9+(4÷(7-3)))=10
(9+(7÷(3+4)))=10
(9-((3-7)÷4))=10
(9-((4-7)÷3))=10
(9-(3÷(4-7)))=10
(9-(4÷(3-7)))=10