(ただし1と2を合せて12のような使い方は出来ません。)
25個の解法が見つかりました。
(((2×9)-5)-3)=10
((2×3)+(9-5))=10
((2×3)-(5-9))=10
((2×9)-(3+5))=10
((2+5)+(9÷3))=10
((3×(9-5))-2)=10
((9+(2×3))-5)=10
((9-5)+(2×3))=10
((9÷3)+(2+5))=10
(2+(5+(9÷3)))=10
(3+((5+9)÷2))=10
(5+(2+(9÷3)))=10
(9+((2×3)-5))=10
(9+((2+3)÷5))=10
(9+((5-2)÷3))=10
(9+((5-3)÷2))=10
(9+(2÷(5-3)))=10
(9+(3÷(5-2)))=10
(9+(5÷(2+3)))=10
(9-((2-5)÷3))=10
(9-((3-5)÷2))=10
(9-(2÷(3-5)))=10
(9-(3÷(2-5)))=10
(9-(5-(2×3)))=10