(ただし1と2を合せて12のような使い方は出来ません。)
38個の解法が見つかりました。
((2+(4+7))-3)=10
((2+4)+(7-3))=10
((2+4)-(3-7))=10
((2+7)+(4-3))=10
((2+7)-(3-4))=10
((2-3)+(4+7))=10
((4+(2+7))-3)=10
((4+7)+(2-3))=10
((4+7)-(3-2))=10
((4-3)+(2+7))=10
((7+(2+4))-3)=10
((7-3)+(2+4))=10
(2×((3×4)-7))=10
(2+((4+7)-3))=10
(2+(4+(7-3)))=10
(2+(4-(3-7)))=10
(2+(7+(4-3)))=10
(2+(7-(3-4)))=10
(2-((3-4)-7))=10
(2-((3-7)-4))=10
(2-(3-(4+7)))=10
(4+((2+7)-3))=10
(4+(2+(7-3)))=10
(4+(2-(3-7)))=10
(4+(7+(2-3)))=10
(4+(7-(3-2)))=10
(4-((3-2)-7))=10
(4-((3-7)-2))=10
(4-(3-(2+7)))=10
(7+((2+4)-3))=10
(7+(2+(4-3)))=10
(7+(2-(3-4)))=10
(7+(4+(2-3)))=10
(7+(4-(3-2)))=10
(7-((3-2)-4))=10
(7-((3-4)-2))=10
(7-(3-(2+4)))=10