47°28′52″+9°43′9″=57°12'1"
125°--45°19'=75°41'
21°26'×5=107°10'
182°38′÷4=48°9'30"
(1°=60' 1'=60",加法满60进一位,减法不够时向前借一位,乘除法分开计算)
47°28′52″+9°43′9″=57°12'1"
125°--45°19'=75°41'
21°26'×5=107°10'
182°38′÷4=48°9'30"
(1°=60' 1'=60",加法满60进一位,减法不够时向前借一位,乘除法分开计算)