Пошаговое объяснение:
а)11°25'+53°40'=64°65'=65°5'
б)28°53'-13°46''=28°52'60''-13°46''=15°52'14''
в)105°12'23''+73°16'49''=178°28'72''=178°29'12''
г)107°59'60''-70°19''=37°59'41''
д)63°12'60''-41°43''=22°12'17''
е)57°60'28''-57°60'5''= 23''
ж)13°23'*6=80°18'
з)16°12'+5°7'-12,1°= 21°19'-12°6'=9°13'
и)67°39'-51°36'=16°3'
