78°27′27〃+56°18′36〃=?

问题描述:

78°27′27〃+56°18′36〃=?

78°27′27〃+56°18′36〃
=78°+27′+27〃+56°+18′+36〃
=134°+45′+63〃
=134°+45′+60"+3〃
=134°+45′+1'+3〃
=134°46′3〃