(1)1-1+16=
(2)18+1-7=
(3)1+9-3=
(4)8-2+1=
(5)1+7-5=
(6)7+8-5=
(7)13-4+10=
(8)9+5-12=
(9)6+10-7=
(10)11-9+1=
(11)5+4-8=
(12)9+1-2=
(13)7+10-5=
(14)9+7-2=
(15)19-19+18=
(1)1-1+16=
(2)18+1-7=
(3)1+9-3=
(4)8-2+1=
(5)1+7-5=
(6)7+8-5=
(7)13-4+10=
(8)9+5-12=
(9)6+10-7=
(10)11-9+1=
(11)5+4-8=
(12)9+1-2=
(13)7+10-5=
(14)9+7-2=
(15)19-19+18=