(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×(5×5))÷5)=10
((2×5)×(5÷5))=10
((2×5)+(5-5))=10
((2×5)-(5-5))=10
((2×5)÷(5÷5))=10
((2÷5)×(5×5))=10
((5×(2×5))÷5)=10
((5×(5-2))-5)=10
((5×5)×(2÷5))=10
((5×5)÷(5÷2))=10
((5+(2×5))-5)=10
((5-5)+(2×5))=10
((5÷5)×(2×5))=10
(2×((5×5)÷5))=10
(2×((5+5)-5))=10
(2×(5×(5÷5)))=10
(2×(5+(5-5)))=10
(2×(5-(5-5)))=10
(2×(5÷(5÷5)))=10
(2÷((5÷5)÷5))=10
(2÷(5÷(5×5)))=10
(5×((2×5)÷5))=10
(5×((2+5)-5))=10
(5×(2×(5÷5)))=10
(5×(2+(5-5)))=10
(5×(2-(5-5)))=10
(5×(2÷(5÷5)))=10
(5×(5×(2÷5)))=10
(5×(5+(2-5)))=10
(5×(5-(5-2)))=10
(5×(5÷(5÷2)))=10
(5+((2×5)-5))=10
(5+((5+5)÷2))=10
(5-(5-(2×5)))=10
(5÷((5÷2)÷5))=10
(5÷((5÷5)÷2))=10
(5÷(5÷(2×5)))=10