Összeadás 3.                                                                       ×vissza

2. feladat megoldása                                                                                                 tovább               megoldás

	3	0	–	5	0	–	4	0	+	2	0	=	–	4	0
–	2	0	–	3	0	+	9	0	–	1	0	=	9	0	–	6	0	=
+	5	0	–	7	0	+	3	0	–	0	=	8	0	–	7	0	=
+	4	0	–	7	0	+	8	0	–	7	0	=	1	2	0	–	1	4	0	=
–	3	0	+	4	0	–	9	0	+	3	0	=	4	0	–	9	0	=