(ただし1と2を合せて12のような使い方は出来ません。)
38個の解法が見つかりました。
((1+4)+(8-3))=10
((1+4)-(3-8))=10
((1+8)+(4-3))=10
((1+8)-(3-4))=10
((1-3)+(4+8))=10
((4+(1+8))-3)=10
((4+8)+(1-3))=10
((4+8)-(3-1))=10
((4-3)+(1+8))=10
((8+(1+4))-3)=10
((8-3)+(1+4))=10
(1+((4+8)-3))=10
(1+(4+(8-3)))=10
(1+(4-(3-8)))=10
(1+(8+(4-3)))=10
(1+(8-(3-4)))=10
(1-((3-4)-8))=10
(1-((3-8)-4))=10
(1-(3-(4+8)))=10
(4+((1+8)-3))=10
(4+(1+(8-3)))=10
(4+(1-(3-8)))=10
(4+(8+(1-3)))=10
(4+(8-(3-1)))=10
(4-((3-1)-8))=10
(4-((3-8)-1))=10
(4-(3-(1+8)))=10
(8+((1+4)-3))=10
(8+(1+(4-3)))=10
(8+(1-(3-4)))=10
(8+(4+(1-3)))=10
(8+(4-(3-1)))=10
(8+(4÷(3-1)))=10
(8-((3-1)-4))=10
(8-((3-4)-1))=10
(8-(3-(1+4)))=10
(8-(4÷(1-3)))=10