(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。
(((3×7)-6)-5)=10
((3×7)-(5+6))=10
((3+7)×(6-5))=10
((3+7)÷(6-5))=10
((5+7)-(6÷3))=10
((6-5)×(3+7))=10
(3+(7×(6-5)))=10
(3+(7÷(6-5)))=10
(3-(7×(5-6)))=10
(3-(7÷(5-6)))=10
(5×((3+6)-7))=10
(5×(3+(6-7)))=10
(5×(3-(7-6)))=10
(5×(6+(3-7)))=10
(5×(6-(7-3)))=10
(5+(7-(6÷3)))=10
(5-((6÷3)-7))=10
(6+((5+7)÷3))=10
(7+(3×(6-5)))=10
(7+(3÷(6-5)))=10
(7+(5-(6÷3)))=10
(7+(6÷(5-3)))=10
(7-((6÷3)-5))=10
(7-(3×(5-6)))=10
(7-(3÷(5-6)))=10
(7-(6÷(3-5)))=10