(ただし1と2を合せて12のような使い方は出来ません。)
28個の解法が見つかりました。
((0+9)+(5÷5))=10
((0÷9)+(5+5))=10
((5+5)+(0×9))=10
((5+5)+(0÷9))=10
((5+5)-(0×9))=10
((5+5)-(0÷9))=10
((5÷5)+(0+9))=10
((5÷5)+(9-0))=10
((5÷5)-(0-9))=10
((9+(5÷5))-0)=10
((9-0)+(5÷5))=10
(0+(9+(5÷5)))=10
(5+(5+(0×9)))=10
(5+(5+(0÷9)))=10
(5+(5-(0×9)))=10
(5+(5-(0÷9)))=10
(5-((0×9)-5))=10
(5-((0÷9)-5))=10
(9+((0+5)÷5))=10
(9+((5-0)÷5))=10
(9+((5÷5)-0))=10
(9+(0+(5÷5)))=10
(9+(5÷(0+5)))=10
(9+(5÷(5-0)))=10
(9-((0-5)÷5))=10
(9-(0-(5÷5)))=10
(9-(5÷(0-5)))=10