59°17′-18°28′=(58°-18°)+(60′+17′-28′)=40°49′
23°15′40″×3=69°45′120′′=69°47′
33.28°(话成度分秒)=33°+(0.28*60)′=33°+16.8′=33°16‘+(0.8*60)''=33°16'48''
33°52′+21°51′=55°43'
59°17′-18°28′=(58°-18°)+(60′+17′-28′)=40°49′
23°15′40″×3=69°45′120′′=69°47′
33.28°(话成度分秒)=33°+(0.28*60)′=33°+16.8′=33°16‘+(0.8*60)''=33°16'48''
33°52′+21°51′=55°43'