(ただし1と2を合せて12のような使い方は出来ません。)
35個の解法が見つかりました。
((3+7)×(7÷7))=10
((3+7)+(7-7))=10
((3+7)-(7-7))=10
((3+7)÷(7÷7))=10
((3-7)+(7+7))=10
((7×(3+7))÷7)=10
((7+(3+7))-7)=10
((7+7)+(3-7))=10
((7+7)-(7-3))=10
((7-7)+(3+7))=10
((7÷7)×(3+7))=10
(3+((7×7)÷7))=10
(3+((7+7)-7))=10
(3+(7×(7÷7)))=10
(3+(7+(7-7)))=10
(3+(7-(7-7)))=10
(3+(7÷(7÷7)))=10
(3-((7-7)-7))=10
(3-(7-(7+7)))=10
(7×((3+7)÷7))=10
(7+((3×7)÷7))=10
(7+((3+7)-7))=10
(7+(3×(7÷7)))=10
(7+(3+(7-7)))=10
(7+(3-(7-7)))=10
(7+(3÷(7÷7)))=10
(7+(7×(3÷7)))=10
(7+(7+(3-7)))=10
(7+(7-(7-3)))=10
(7+(7÷(7÷3)))=10
(7-((7-3)-7))=10
(7-((7-7)-3))=10
(7-(7-(3+7)))=10
(7÷(7÷(3+7)))=10