107°-52°32′30〃

107°-52°32′30〃
=106°59′60〃 -52°32′30〃
=106-52°59-32′60-30〃
=54°27′30〃
39°48′＋47°37′
=39+47°48+37′
=86°85′
=86°60+25′
=87°25′
25°36′24〃×4
=25×4°36×4′24×4〃
=100°144′96〃
=100°120*4′60+36〃
=102°5′36〃