(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。
((1+5)+(2×2))=10
((1+5)+(2+2))=10
((2×(1+5))-2)=10
((2×2)+(1+5))=10
((2×5)×(2-1))=10
((2×5)÷(2-1))=10
((2+2)+(1+5))=10
((2+5)+(1+2))=10
((2-1)×(2×5))=10
(1+(2+(2+5)))=10
(1+(5+(2×2)))=10
(1+(5+(2+2)))=10
(2×(5×(2-1)))=10
(2×(5÷(2-1)))=10
(2+(1+(2+5)))=10
(2+(2×(5-1)))=10
(2+(2+(1+5)))=10
(2+(5+(1+2)))=10
(2-(2×(1-5)))=10
(2÷((2-1)÷5))=10
(5×(1+(2÷2)))=10
(5×(2×(2-1)))=10
(5×(2÷(2-1)))=10
(5+(1+(2×2)))=10
(5+(1+(2+2)))=10
(5+(2+(1+2)))=10
(5÷((2-1)÷2))=10