一、填空题
1. $0.4° =$ $'$
2. $0.4° =$ $''$
3. $33' =$ $°$
4. $33' =$ $''$
5. $23°30' =$ $°$
6. $35°19' =$ $'$
7. $43.21° =$ $°$ $'$ $''$
8. $57.27° =$ $°$ $'$ $''$
9. $48°15'36'' =$ $°$
10. $21°32'24'' =$ $°$

1. 24
2. 1440
3. 0.55
4. 1980
5. 23.5
6. 2119
7. 43 12 36
8. 57 16 12
9. 48.26
10. 21.54

二、计算题
11. $56°18'+72°48'$
12. $127°34'-51°29'15''$
13. $58°38'27''+47°42'40''$
14. $120°-36°43'24''$
15. $48°39'+67°31'-21°17'$
16. $180°-45°17'-52°57'$
17. $98°12'21''-20°42'44''+15°16'35''$
18. $90°-(36°31'51''+12°22'15'')$
19. $62°53'46''+36°18'28''-52°48'53''$
20. $156.635°-(17°35'24''+35°36'40'')$

11. $129°6'$
12. $76°4'45''$
13. $106°21'7''$
14. $83°16'36''$
15. $94°53'$
16. $81°46'$
17. $92°46'12''$
18. $41°5'54''$
19. $46°23'21''$
20. $103°26'2''$