23°30′=_° 78.36°=_°_′_″ 52°45′-32°46′=_°_′ 18.3°+26°34′=_°_′.

问题描述:

23°30′=______°         
78.36°=______°______′______″
52°45′-32°46′=______°______′
18.3°+26°34′=______°______′.

∵30′=0.5°,
∴23°30′=23.5°;
∵0.36°=(0.36×60)′=21.6′,
0.6′=36″,
∴78.36°=78°21′36″;
52°45′-32°46′
=51°105′-32°46′
=19°59′;
18.3°+26°34′
=18°18′+26°34′
=44°52′;
故答案为:23.5,78,21,36,19,59,44,52.