30°19′21〃+15°40′42〃

问题描述:

30°19′21〃+15°40′42〃

的期望的权威地区

30°19′21〃+15°40′42〃
=(30+15)°(19+40)'(21+42)"
=45°59'63"
=45°60'3"
=46°0'3"