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那么， an+bn=_________;an-bn=__________;?
?(an·bn)=__________; =_____________(b≠0).?
特别地，如果C是常数，那么(Cbn)=_____________.?
an=a, 
bn=b，? 
an+
bn=_________;
an-
bn=__________;?
(an·bn)=__________; 
=_____________(b≠0).?
(Cbn)=_____________.?