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Calculați
a) 75°+25° 30' =
b) 27° 45' 32'' + 105° =
c) 75° + 25° 30' + 27° 45' 32'' =
d) 75°- 25° 30' =
e) 75° - 27° 45' 32'' =
f) 27° 45' 32'' - 25° 30' =