(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。
((1+1)+(3+5))=10
((1+3)+(1+5))=10
((1+5)+(1+3))=10
((3+5)+(1+1))=10
((3-1)×(1×5))=10
((3-1)×(5÷1))=10
((3-1)÷(1÷5))=10
((5×(3-1))÷1)=10
((5÷1)×(3-1))=10
(1×(5×(3-1)))=10
(1+(1+(3+5)))=10
(1+(3+(1+5)))=10
(1+(5+(1+3)))=10
(3+(1+(1+5)))=10
(3+(5+(1+1)))=10
(5×((1×3)-1))=10
(5×((3-1)÷1))=10
(5×((3÷1)-1))=10
(5×(1×(3-1)))=10
(5×(3-(1×1)))=10
(5×(3-(1÷1)))=10
(5+(1+(1+3)))=10
(5+(3+(1+1)))=10
(5÷(1÷(3-1)))=10