（ただし１と２を合せて１２のような使い方は出来ません。）
50個の解法が見つかりました。
((2×6)-(9-7))=10
((2+(6+9))-7)=10
((2+6)+(9-7))=10
((2+6)-(7-9))=10
((2+9)+(6-7))=10
((2+9)-(7-6))=10
((2-7)+(6+9))=10
((6×(9-7))-2)=10
((6+(2+9))-7)=10
((6+9)+(2-7))=10
((6+9)-(7-2))=10
((6-7)+(2+9))=10
((7+(2×6))-9)=10
((7-9)+(2×6))=10
((9+(2+6))-7)=10
((9-7)+(2+6))=10
(2+((6+9)-7))=10
(2+(6+(9-7)))=10
(2+(6-(7-9)))=10
(2+(9+(6-7)))=10
(2+(9-(7-6)))=10
(2-((7-6)-9))=10
(2-((7-9)-6))=10
(2-(7-(6+9)))=10
(6+((2+9)-7))=10
(6+(2×(9-7)))=10
(6+(2+(9-7)))=10
(6+(2-(7-9)))=10
(6+(9+(2-7)))=10
(6+(9-(7-2)))=10
(6-((7-2)-9))=10
(6-((7-9)-2))=10
(6-(2×(7-9)))=10
(6-(7-(2+9)))=10
(7+((2×6)-9))=10
(7+((2×9)÷6))=10
(7+(2×(9÷6)))=10
(7+(2÷(6÷9)))=10
(7+(9×(2÷6)))=10
(7+(9÷(6÷2)))=10
(7-(9-(2×6)))=10
(9+((2+6)-7))=10
(9+(2+(6-7)))=10
(9+(2-(7-6)))=10
(9+(6+(2-7)))=10
(9+(6-(7-2)))=10
(9-((7-2)-6))=10
(9-((7-6)-2))=10
(9-(7-(2+6)))=10