Question

12度31’21”除以3+18度’？

Answer 1

12°31′21″÷3+18°
=4+31’21″÷3+18
=22+31/60*1/3+21/3600*1/3
=22+31/180+7/3600
=22+0.172+0.00194
=22.174（度）

Answer 2

12°31′21″÷3+18°=4°+31′21″÷3+18°
=22°+10′+81″÷3
=22°10′27″
其中 (31÷3=10.........1
1′=60″
60″+21″=81″)