计算(1)58°39′+67°33′-21°17′*5(2)109°11′4″/7
计算(1)58°39′+67°33′-21°17′*5(2)109°11′4″/7
(1)58°39′+67°33′-21°17′*5
=125°72‘-105°85’
=125°72‘-106°25’
=19°47‘
(2)109°11′4″/7
=(109°+11′4″)/7
=15°+(240’+11′4″)/7
=15°+(251’+4″)/7
=15°35‘+(6’+4″)/7
=15°35‘+364″/7
=15°35‘52“
1、58°39‘+67°33’-21°17‘=(58°+67°-21*5)+(39’+33‘-17’*5)
=105°-105°+72‘-85’
=-7‘
2、109°11’4‘’/7=(109°+11‘+4‘’)/7
=15°+[(4*60’+4‘’)/7]
=15°+[(240‘+4’‘)/7]
=15°+30'+[(30*60''+4)/7]
=15°30’+(184''/7)
=15°30‘+26’‘
=15°30’26‘’
(1)58°39′+67°33′-21°17′*5
=126°12‘-106°25’
=19°47‘
(2)109°11′4″/7
=15°+251'4''÷7
=15°35’+364‘’÷7
=15°35‘52’‘