第130页 - 亮点给力提优课时作业本七年级数学江苏版

C

D

94°53′

$74.325$

$ \begin{aligned} 解：原式&= 179°59'70'' \\ &= 179°60'10'' \\ &= 180°10'' \\ \end{aligned}$

解:原式=90°-45°123'87"

= 89°59'60"-47°4'27''

=42°55'33"

B

A