-2
(a,b)(c,d)=(ad+bc,bd),on the set {(x,y)∈ RR:y≠0}.
(a,b)(c,d)=(ac,bc+d), on the set {(x,y)∈ RR:x≠0}.
Same operation as in part 2, but on the set R*R.
(a,b)(c,d)=(ac-bd,ad+bc),on the set RR with the origin deleted.
Consider the operation of the preceding problem on the set R*R. Is this a group?Exp...