度分秒计算.(加减)

问题描述:

度分秒计算.(加减)
90°-78°23′34〃=?

90°-78°23′34"
=89°59′60"-78°23′34"
=(89°-78°)+(59′-23′)+(60"-34")
=11°+36′+26"
=11°36′26"