56.6°+72°43'= 56°36'+72°43' =128°79'=129°19'
3*56°36’=168°108' =169°48'
176°52’/3约等于174 °171'60"/3=58°57'20"
35°27'48*49-49°54'/6=1715°1323' 2352"-48°114'/6
=1737°42' 12"-8°19'
=1729°23'12"
角的除法运算56.6°+72°43'= （ ）3*56°36’=（ ）176°52’/3约等于（ ）35°27'48*4