(ただし1と2を合せて12のような使い方は出来ません。)
21個の解法が見つかりました。
((2×5)×(6-5))=10
((2×5)÷(6-5))=10
((5×(6÷2))-5)=10
((5×6)÷(5-2))=10
((5÷(2÷6))-5)=10
((6×(5÷2))-5)=10
((6-5)×(2×5))=10
((6÷(2÷5))-5)=10
(2×(5×(6-5)))=10
(2×(5÷(6-5)))=10
(2×(6-(5÷5)))=10
(2÷((6-5)÷5))=10
(5×(2×(6-5)))=10
(5×(2÷(6-5)))=10
(5×(5-(6÷2)))=10
(5×(6÷(5-2)))=10
(5÷((5-2)÷6))=10
(5÷((6-5)÷2))=10
(6×(5÷(5-2)))=10
(6÷((5-2)÷5))=10