(ただし1と2を合せて12のような使い方は出来ません。)
29個の解法が見つかりました。
((2×2)+(9-3))=10
((2×2)-(3-9))=10
((2+(2+9))-3)=10
((2+2)+(9-3))=10
((2+2)-(3-9))=10
((2+9)+(2-3))=10
((2+9)-(3-2))=10
((2-3)+(2+9))=10
((9+(2×2))-3)=10
((9+(2+2))-3)=10
((9-3)+(2×2))=10
((9-3)+(2+2))=10
(2×(2+(9÷3)))=10
(2+((2+9)-3))=10
(2+(2+(9-3)))=10
(2+(2-(3-9)))=10
(2+(9+(2-3)))=10
(2+(9-(3-2)))=10
(2-((3-2)-9))=10
(2-((3-9)-2))=10
(2-(3-(2+9)))=10
(9+((2×2)-3))=10
(9+((2+2)-3))=10
(9+(2+(2-3)))=10
(9+(2-(3-2)))=10
(9-((3-2)-2))=10
(9-(3-(2×2)))=10
(9-(3-(2+2)))=10