解27°32'16''+36°48'47''
=（27°+36°）+（32'+48'）+（16''+47'')
=（63°）+（80'）+（63'')
=（63°）+（1°+20'）+（1'+3'')
=（64°）+（20'+1'）+3''
=（64°）+（21'）+3''
=64°21'3''