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...