Ajutati-ma va rog, DAU COROANA!!!

a.20°30'14"+25°15'28"=45°45'32"
b.40°48'45"+46°29'43"=87° 8' 28"
c.100°17'13"-40°28'16"= 59° 48' 57"
d.42°17'18" × 4=162°68'72"= 163°09'12"
e.49°:2 = 24°30'