Explicație pas cu pas:
a) 13°23'+145°27'-28°48'=(13+145)°+(23+27)'-28°48'=
=158°50'-28°48'= 158°+50'-(28°+48')=
158°+50'-28°-48'= (158°-28°)+(50'-48')= 130°2'
b) 12×13°23'-145°27'= 160°36'-145°27'= (160-145)°+(36-27)'=
= 15°9'
c) 145°27':3= 48°29'
d) 28°48':6= 4°48'
e) 2×13°23'+145°27'-5×28°48'=
= 26°48'+145°27'-144°= 172°13'-144°=28°13'
f) 3×13°23'+145°27'+2×28°48'=
= 40°9'+145°27'+57°36'= 186°36'+ 57°36' = 243°12'
