(ただし1と2を合せて12のような使い方は出来ません。)
24個の解法が見つかりました。
(((4×5)-7)-3)=10
((3×4)+(5-7))=10
((3×4)-(7-5))=10
((3+7)×(5-4))=10
((3+7)÷(5-4))=10
((4×5)-(3+7))=10
((5+(3×4))-7)=10
((5-4)×(3+7))=10
((5-7)+(3×4))=10
((7×(5-3))-4)=10
(3+(7×(5-4)))=10
(3+(7÷(5-4)))=10
(3-(7×(4-5)))=10
(3-(7÷(4-5)))=10
(4+(3×(7-5)))=10
(4-(3×(5-7)))=10
(5+((3×4)-7))=10
(5-(7-(3×4)))=10
(7+((4+5)÷3))=10
(7+(3×(5-4)))=10
(7+(3÷(5-4)))=10
(7-(3×(4-5)))=10
(7-(3÷(4-5)))=10