Ambil sebarang a unsur di U dan r unsur di R, adit ar & ra unsur di U.
Untuk itu harus di tunjukan bahwabf(ar)=0 & f(ra)=0.
perhatikan: f(ar)=f(a).f(r)=0.f(r)=0 & f(ra)=f(r).f(a)=f(r).0=0
ini berarti ar & ra unsur di U.
Mei 28, 2012
Jawaban 5
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rmtitis 
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Komentar oleh http://evliamauygun.net/blog/325/important-programs-in-womens-coat — Desember 31, 2013 @ 10:22 am