1、153°39'+25°40'38" 2、90°-37°24‘38” 3、25°53’8“×5 4、15°20‘36

1、153°39'+25°40'38"
=178°79'38"
= 179°19'38"
2、90°-37°24'38"
=53°-24'38"
=52°36'-38"
=52°35'22"
3、25°53'8"×5
=25°×5+53'×5+8"×5
=125°+265'+40"
= 129°15'40"

90°-37°18′42〃
=89°59‘60”-37°18′42〃
=52°41'18"

{1} 53°9′+25°4′38′′
=78°13′38′′
{2} 90°-37°42′38′′
=89°59′60′′-37°42′38′′
=52°17′22′′
{3} 25°53′28′′×5
=125°265′140′′
=125°267′20′′
=129°27′20′′
{4} 15°20′÷6
=920'/6
=153又3分之1′
=153′20"
=2°33′20"