1.度、分、秒的相互转化:
(1)$57.32° = \_\_\_\_\_\_° \_\_\_\_\_\_' \_\_\_\_\_\_''$;
(2)$27°14'24'' = \_\_\_\_\_\_°$;
(3)$12°18' = \_\_\_\_\_\_°$;
(4)$6000'' = \_\_\_\_\_\_' = \_\_\_\_\_\_°$。
答案:1.(1)57 19 12 (2)27.24 (3)12.3 (4)100 $\frac{5}{3}$
2.计算:
(1)$42°48'+36°25'$;
(2)$18°20'+6°30'$;
(3)$180°-48°39'40''$;
(4)$38°49'×3$;
(5)$33°15'16''×5$;
(6)$180°÷8$;
(7)$56°17'+12°45'-16°21'$;
(8)$131°28'-51°32'15''$;
(9)$58°38'27''+47°42'40''$;
(10)$34°25'×3+35°42'$。
答案:2.(1)$79°13'$ (2)$24°50'$ (3)$131°20'20''$
(4)$116°27'$ (5)$166°16'20''$ (6)$22.5°$
(7)$52°41'$ (8)$79°55'45''$
(9)$106°21'7''$ (10)$138°57'$