计算.(1)90°-40°56′; (2)38°45′+72.5°(结果用度表示)

问题描述:

计算.(1)90°-40°56′; (2)38°45′+72.5°(结果用度表示)

(1) 49°4′ = (49 + 4/60)° = 49.0667°
(2) 38°45′+72.5° = (38 + 45/60)° + 72.5° = 38.75° + 72.5° = 111.25°