Răspuns:
Explicație pas cu pas:
57°4'+25°37'-40°54' = (57 + 25 - 40)° + (4 + 37 - 54)' = 42° - 13' = 41°60' - 13' =
= 41°47'
___________
125°47'16'+28°14'25'+3°4'49' = (125 + 28 + 3)° + (47 + 14 + 4)' + (16 + 25 + 49)'' = 156° + 65' + 90'' = 156° + 1°5' + 1'30'' = 157°6'30''