(ただし1と2を合せて12のような使い方は出来ません。)
27個の解法が見つかりました。
(((4×5)-6)-4)=10
((4×5)-(4+6))=10
((4×5)÷(6-4))=10
((4+6)×(5-4))=10
((4+6)÷(5-4))=10
((5+6)-(4÷4))=10
((5-4)×(4+6))=10
(4×(5÷(6-4)))=10
(4+(6×(5-4)))=10
(4+(6÷(5-4)))=10
(4-(6×(4-5)))=10
(4-(6÷(4-5)))=10
(4÷((6-4)÷5))=10
(5×((4+4)-6))=10
(5×(4+(4-6)))=10
(5×(4-(6-4)))=10
(5×(4÷(6-4)))=10
(5+(6-(4÷4)))=10
(5-((4÷4)-6))=10
(5÷((6-4)÷4))=10
(6+(4×(5-4)))=10
(6+(4÷(5-4)))=10
(6+(5-(4÷4)))=10
(6-((4÷4)-5))=10
(6-(4×(4-5)))=10
(6-(4÷(4-5)))=10